| Name | Location |
|---|
| O & C Construction Ltd | London |
| O & C Roofing & Building Ltd | Gerrards Cross |
| O & E Developments Ld | Bedfordshire |
| O & E Services Ltd | Hull |
| O & H Electrical Ltd | Torquay |
| O & J Electrical | Bewdley |
| O & J Electrical (Property Services Ltd) | Malmesbury |
| O & K | Canterbury |
| O & K Electrical | Fleet |
| O & M Electrical Solutions | Birmingham |
| O & M property Solutions Ltd | Newton-le-willows |
| O & O Cleaning Solutions Ltd | Nettleham |
| O & O Electrical Ltd | Oxon |
| O & S Building Services | Polegate |
| O A Cleaning Services | Bloxwick |
| O and M Finishes | 44 congress road, London, Greater London |
| O AND N PROPERTIES LTD | Haverfordwest |
| O B B Builders | London |
| O B Contractors | Hartfield |
| O B Decorators Ltd | Loughborough |
| O B Painting & Decorating | West Molesey |
| O B Unique | London |
| O B W Plumbing Services | Glasgow |
| O C A Developments | Hoddesdon |
| O C B (Electrical) Ltd | Pinner |
| O C D Cleaners | Dalton |
| O C Electrical Ltd | Royston |
| O C M Gardening | Rotherham |
| O C O Ltd | Bromley |
| O C S Cleaning Services | Bingley |
| O Calpin | York |
| O D C Building | Manchester |
| O D Electrical | Oldbury |
| O D Electrical | Bournemouth |
| O D G Construction Ltd | Orpington |
| O D S Electrical Services Ltd | Farnborough |
| O Dowd Electrical Services | Leominster |
| O F C Electrical Ltd | Bishop Auckland & Evenwood |
| O G C Maintenance Ltd | Whitstable |
| O G Conversions | Saffron walden |
| O G D Ltd | Polegate |
| O G Electricals | Croydon |
| O G Hair & Aesthetics | Knebworth |
| O G Harries Ltd (Llanelli) | Llanelli |
| O G S Gardening Ltd | Dartford |
| O G W Property Solutions | Bognor regis |
| O Gee Construction | Hengrove |
| O Gordon Heating Services | Wembley |
| O H K Fire & Electrical Services | London |
| O J A S Electrics | Stourport-on-severn |
| O J F Electrical Ltd | Chelmsford |
| O J H Bathrooms Ltd | Worthing |
| O J H Painting & Decorating | Pembury |
| O J Hadridge | Beccles |
| O J Little | Stratford-upon-avon |
| O J Morgan Services Ltd | Brecon |
| O J P Plumbing & Heating | Taverham |
| O J Painting & Decorating Services Ltd | Portsmouth |
| O L B Building Services Ltd | Potters Bar |
| O M C Plumbing Ltd | Dungannon |
| O M Carriers Ltd | Glasgow |
| O M Electrics | Bristol |
| O M G Tiling | Bingley |
| O M S Electrical | Colchester |
| O M T Appliance Repairs | Castleford |
| O N E Choice Tiling Ltd | Dunmow |
| O N S Building Contractors Ltd | London |
| O N T Electrical Contractors | St thomas |
| O P M | Evesham |
| O P Plumbing & Heating Ltd | Bodmin |
| O P R Electrical Ltd | Dungannon |
| O P Services | Ilford |
| O R B Electrics (North East) Ltd | Newcastle upon tyne |
| O R Building Services Ltd | Solihull |
| O R Electric Ltd | London |
| O R Jones and Co | Gwynedd |
| O R Lea Plumbing | Waterlooville |
| O S Electrical | Seamer |
| O S Facilities | Ripon |
| O S I Electrics | Borehamwood |
| O S N Group | Southall |
| O S Plumbing & Tiling | Croydon |
| O S V O | Boston |
| O Smith Electrical | Tiverton |
| O Smith Electrical | Tiverton |
| O T B Electrical Contractors | Stourport-on-severn |
| O T M Plumbing & Heating | Norwich |
| O V Bartlett & Sons Cardiff Ltd | Cardiff |
| O W Ellis | Clwyd |
| O W Plumbing & Heating | Birmingham |
| O&A Carpentry | Woughton On The Green |
| O&T Property Maintenance | Lemsford |
| O&T Property Solutions | London |
| O'Brien Construction | Knaresborough |
| O'Brien Electrical Services | Rhiwbina |
| O'Brien Heating and Plumbing Services | Liverpool |
| O'Brien Property Services | Northwich |
| O'Briens Electrical Ltd | Bexley |
| O'Briens Electrical Services Ltd | Tunbridge wells |
| O'Briens Gas & Plumbing Services | Burnley |
| O'C Electrics | Tooting |
| O'Connell | Clevedon |
| O'Connell Building Contractors | Stanmore |
| O'Connell Plastering & Rendering Co | Peterborough |
| O'Connor & Co Removals Limited | O'connor And Co Removals Ltd, Callywhite |
| O'Connor & Sons | Chester |
| O'Connor Electrical Ltd | Hilton |
| O'Connor Pest Control | Manchester |
| O'Connor Plumbing and Heating Services | Dumfries |
| O'Connor Rendering & Plastering | Bacup |
| O'Donnell Building Services | Rosewell |
| O'Donnell Contractors | St albans |
| O'Donnell Plumbing and Heating | Glasgow |
| O'Dwyer Funeral Directors ltd () | 137 Little Ealing Lane |
| O'flynn Carpentry & Joinery | Croydon |
| O'Flynn Construction | Bexley |
| O'Grady (Electrical) Engineering Ltd | Widnes |
| O'Hagan Electrical Limited | Dungannon |
| O'Hanlon & Farrell Electrical Ltd | Newry |
| O'Hanlon and Sons Ltd | Dagenham |
| O'Hanlon Electrical LTD | Dungannon |
| O'Hara Maintenance | Bradford |
| O'Kane Construction Ltd | Coleraine |
| O'Kane Plumbing & Electrics Ltd | Cookstown |
| O'Keefe Electrical LTD | Adamsdown |
| O'Keeffe Building Services Ltd | Nottingham |
| O'Keeffe Gas Services | Bridlington |
| O'Malley Property | Alloa |
| O'Neil Gas Services Limited | Ayrshire |
| O'Neil Plumbing & Heating Engineers | Northwich |
| O'Neill & Holman | Paignton |
| O'Neill Carpentry Ltd | Betws |
| O'Neill Decor | Harrow |
| O'Neill Electrics Ltd T/A Mechanical & Electrical Services | Omagh |
| O'Neill Plasterers | Clydebank |
| O'Neill Plumbing & Heating | Frome |
| O'Neill Roofing | Tamworth |
| O'Neill's Roofing | Colne |
| O'Neills Fencing & Gardening Services | London |
| O'Neills Funeral Directors Ltd | County_antrim |
| O'Neills Plumbing | Millom |
| O'Regan Electrical | Luton |
| O'Reilly Builders | Reigate |
| O'Rileys Autos Mobile Mechanic | Biggleswade |
| O'Shea Decorating | London |
| O'Shea Electrical | Poole |
| O'Sullivan Electrical | Eynsham |
| O'Sullivan Electrical Services | Shoeburyness |
| O'Sullivan Installation Ltd | West Midlands |
| O'Sullivans | Harlow |
| O'Sullivans Roofing Services | London, Greater London |
| O-K Smart Home Technology Ltd | Ealing |
| O-One Cleaning Services | Swindon |
| O-P-M Building services | Wallingford |
| O. J. Electrics | Uttoxeter |
| O. Karpovych | Cambridge |
| O.B. Brows | Wolverhampton |
| O.B. Home Improvements Limited | Kitts Green |
| O.D Roofing Services | 3 Gibson Close, Chessington, London, Sur |
| O.D.C Heat | Littlehampton |
| O.N Plumbing & Heating (Leeds) Ltd | Burley |
| O.P.S Oldales Pipework Solutions Ltd | Weaverham |
| O.W. Francis | Staines-upon-thames |
| O2 Plumbing & Heating Service Ltd | Watford |
| O?Sullivan Property Consultants Ltd | London |
| OAC Electrical | Sleaford |
| Oades Builders Ltd | Hove |
| OAE (SW) Ltd | St Thomas |
| Oak and Ash Landscape and Trees | Twickenham |
| Oak Apple Decor Ltd | Selby |
| Oak Apple Landscapes | Kent |
| Oak Apple Landscapes | Whitstable, Whitstable, Kent |
| Oak Bridge Developments Ltd | Tadley |
| Oak Building Services Ltd | Hazel Grove |
| oak carpentry projects lancs ltd | Oldham, Lancashire |
| Oak Constructions | West Sussex |
| Oak Decorating | Liverpool |
| Oak Electrical | Londonderry |
| Oak Electrical Ltd | Castleford |
| Oak Electrotechnical Ltd | Hartlepool |
| Oak Funeral Services Ltd (Williton) | Williton |
| Oak Gardening Services | Gatehead |
| Oak handyman builder | Slough |
| Oak Hill Fencing & Landscaping | Surbiton |
| Oak Hill Joinery Ltd | Pulloxhill, Bedfordshire |
| Oak Homes Joinery Ltd | Axminster, Devon |
| Oak Landscapes Ltd | Orpington |
| Oak Landscapes Ltd | Kent |
| Oak Lane Group | Eckington |
| Oak Leaf Tree Care & Landscaping | Kidderminster |
| Oak Leaf Tree Care & Landscaping | Worcestershire |
| OAK Plumbing and Heating | Colchester |
| Oak Roofing Services | Croydon |
| Oak Tree Electrical | Catbrook |
| Oak Tree Renovations Ltd | Cheltenham |
| Oak Valley Construction | Sutton Trinity |
| Oak Valley Plastering | Upton |
| Oakbridge Joinery Ltd | Bottesford |
| Oakbrooks Removals Mansfield | Mansfield |
| Oakbuild Construction | Sutton coldfield |
| Oakdale Electrical Contractors | Jarrow |
| Oakdale Electrical Contractors Ltd | Blackburn |
| Oakdene Auto's Limitied | Cranes Close, Basildon, Essex |
| Oakdene Landscapes Ltd | Surrey |
| Oake Electrical (Kent) | Gravesend |
| Oakenhall Building Services Ltd | Nottingham |
| Oakenshield Construction Ltd | Wisbech |
| Oakenstone Design Planning Build | Matlock |
| Oakes Electrical Solutions Ltd | Studley |
| Oakes Power Services Ltd | Sittingbourne |
| OAKESUK LTD | Holmes chapel |
| Oakey & Son Limited Electrical Services | 1 Station Villa, High Street, Blakeney, |
| Oakey Electrical | Llangollen |
| Oakfield Developments Norfolk Ltd | Snettisham |
| Oakfield Electrical Ltd | High wycombe |
| Oakfield Estate Agents | St. leonards-on-sea |
| Oakfield Estate Agents - Bexhill | Bexhill-on-sea |
| Oakfield Estate Agents - Eastbourne | Eastbourne |
| Oakfield Home and Garden | West Yorkshire |
| Oakfield Move It Mow It | Kilgetty |
| Oakfield Property Management | Buckley |
| Oakfield Renovations | Clifton |
| Oakfit ltd | Darlongorn |
| Oakgrove Cabinets | Londonderry |
| Oakham | Bury |
| Oakham Electrical Services LTD | Clipstone village |
| Oakhill Construction | Woodford green |
| Oakhill Electrical Services | Newcastle under lyme |
| Oakhill Estate Agents | Isleworth |
| Oakhill Installations | Addlestone |
| Oakhill Residential | London |
| Oakhouse Property Development Ltd t/a Oakhouse Builders | Wokingham |
| Oakhurst Building Contractors | East grinstead |
| Oakhurst Construction | Church stretton |
| Oakhurst Gas Services | Sparkhill |
| Oaklan Construction Limited | Croydon |
| Oakland Air Control Ltd | Worcester |
| Oakland Builders Specialist Builders Ltd | Romford |
| Oakland Carpentry | Unit 1 Fould Farm, Leek Frith, Leek |
| Oakland Fencing & Landscape Specialists | Essex |
| Oakland Fencing & Landscape Specialists Ltd | Colchester |
| Oakland Fencing & Landscapes | Chester |
| Oakland Plumbing and Heating | Carlisle East |
| Oakland Roofing Ltd | Kent |
| Oakland Roofing Ltd | Cudham |
| Oaklands Contracts Ltd | Welwyn |
| Oaklands Funeral Service Ltd (Chichester) | Chichester |
| Oaklands Kitchens Ltd | Hove |
| Oaklands Roofing and Building Ltd | Sandridge |
| Oaklands Tree Specialists Ltd | St Albans, Hertfordshire |
| Oaklands Tree Specialists Ltd. | St Albans, Hertfordshire |
| Oakleaf Building Contractors | Newport |
| Oakleaf Developments | Leicestershire |
| Oakleaf Electrical Contractors Ltd | Maidstone |
| Oakleaf Electrical Contractors Ltd | Maidstone |
| Oakleaf Glamping Pods | Lancashire |
| Oakleaf Roofing & Building Ltd | London |
| Oakleaf Roofing Ltd | Spratton |
| Oakleigh Decorating & Maintenance | Market rasen |
| Oakleigh Drives & Patios Ltd | Hayes |
| Oakleigh Electrical | Lincoln |
| Oakleigh Electrical Contractors Ltd | Newhaven |
| Oakleigh Heating Ltd | Dobbins Lane, Wendover, Aylesbury |
| Oakleigh Plastering | Wigston |
| Oakleigh Plumbing & Heating Ltd | Sherborne |
| Oakley & Edwards Ltd | Melksham |
| Oakley Builders (Leeds) Ltd | Leeds |
| Oakley Contractors | Farnham |
| Oakley contracts | Belfast |
| Oakley Creations Ltd | Trowbridge |
| Oakley Design & Build Ltd | Cheltenham |
| Oakley Electrical | Corby |
| Oakley Electrical | Maldon |
| Oakley Electrical Contractors | Blackwood |
| Oakley Electrical Contractors Ltd | 26 Wistaria Close, Newport |
| Oakley Flooring | Sheffield |
| Oakley Home Improvements Ltd | Ashford |
| Oakley Interiors | East Sussex |
| Oakley Jane | Aylesbury |
| Oakley Landscapes | Mortlake |
| Oakley plumbing and heating solutions | Derby |
| Oakley Property | East sussex |
| Oakley Property | Shoreham-by-sea |
| Oakley Property | Brighton |
| Oakley Property | Lewes |
| Oakley Roofing Services | Tadley |
| Oakleys Electrical Services | Wimborne |
| Oakmarenna Ltd | Witham |
| Oakmere Homes Lancaster Ltd | Lancaster |
| Oakmont Electrical & Security | Romford |
| Oakmont Electrical Ltd | Hyton |
| Oakmont Roofing | Radstock |
| Oakmoor Fencing & Gardening Services | Dudley |
| Oakmoor Heating Ltd | Twickenham |
| Oakmore Builders Limited | Orpington, Kent |
| Oakmore Contracts | Magherafelt |
| Oakmount Property Services | Manchester |
| Oakpark Alarms Security Services Ltd T/A | Buckingham |
| Oakray Ltd | Enfield |
| Oaks Electrical & Renewables Ltd | Balby |
| Oaks Electrical Ltd | Cullompton |
| Oaks Electrical Services | Smethwick |
| Oaksheer ltd | Lichfield |
| Oaksmith Building | Gloucester |
| Oakston Solutions | 8 dickens way, yateley, Hampshire |
| Oakstone Electrical Ltd | Congleton |
| Oakstone Interiors LTD | Denton |
| Oaksure Construction | Croydon |
| Oakton Estates | West midlands |
| Oaktree | London |
| Oaktree Construction of Sevenoaks Ltd | Sevenoakes |
| Oaktree Electrical Ltd | Wrotham |
| Oaktree Kent Ltd | Chatham |
| Oaktree Landscaping | Bridgwater |
| oaktreesfencing | Essex |
| Oakvale Kitchens & Wardrobes | Maidstone, Kent |
| Oakvalley Roofing | Mansfield |
| Oakview Developments | Gravesend |
| Oakville Contractors Ltd | Portslade |
| Oakwater Interiors | Cardiff, Vale of Glamorgan |
| Oakway Electrical Limited | Orpington |
| Oakwell Kitchens | Rhondda Cynon Taf |
| Oakwell Windows and Doors | Northumberland |
| Oakwolf Gardening | Hampshire |
| Oakwood Bespoke Joinery | Old Icknield Way, Benson, Oxfordshire |
| Oakwood Building | Norwich |
| Oakwood building group ltd | West Midlands |
| Oakwood Carpentry & Maintenance | Hampshire |
| Oakwood Construction | West Midlands |
| Oakwood Energy Ltd | Cheshire |
| Oakwood Energy Systems | East cowes |
| Oakwood Estate Agents | London |
| Oakwood Flooring Services | Glasgow |
| Oakwood Garden & Property Maintenance | Halesowen |
| Oakwood Garden and Ground Maintenance Ltd | Cambridge |
| Oakwood Garden Services | Doncaster |
| Oakwood Gardens Ltd | Farnborough |
| OAKWOOD HOME SOLUTIONS | Dalkeith |
| Oakwood Property Management | Peterborough |
| Oakwood Refurbishment Ltd | Battersea |
| Oakworth Electrical LTD | Eaglescliffe |
| OAS Electrical Solutions | Romford |
| Oasis Bathroom Solutions Ltd | Gosport |
| Oasis Bathroom Solutions Ltd | Hampshire |
| Oasis Cleaners | Maida Vale |
| Oasis Grounds Maintenance Ltd | Wellingborough |
| Oasis Laminate Floors Ltd | Nuneaton |
| Oasis Plumbing & Gas | Heanor |
| Oasis Software Solutions Ltd | Monmouth |
| Oasthouse Gas, Plumbing & Heating | Greenford |
| Oasys Property Solutions | 96 Hampton Road, Redland, Bristol |
| OATLANDS | Surrey |
| Oatpoint Ltd T/A Wheelers | Wallingford |
| Ob & D Electricals | Manchester |
| OB Building & Roofing | Dalton |
| OB Property | Chelmsford |
| OB-Solutions (Yorkshire) Ltd | Leeds |
| Oban Electrical Services Ltd | Oban |
| Obbard | London |
| OBC Building and Construction | 1 Bromley lane, Chislehurst, Kent |
| OBC London Limited | Petts Wood |
| OBD Electrical | Warrington |
| Obe & Co Design Ltd | THE OLD DAIRY, Manor Court Farm, Tunbridge Wells, Kent |
| Obelisk Networks UK Ltd | Southampton |
| Oben Interiors Ltd | Cheshire |
| Oben Kitchen | Cheshire |
| Ober Construct Ltd | Belvedere |
| Oberon Solar and Heating | Farnley |
| Obespoke & Obbard Design & Development | The Yacht Club, Chelsea Harbour, Chelsea, Greater London |
| Obi Building Services | London |
| Obi gas | Bridport |
| Object Limited | Surrey |
| OBP Obrien Properties Ltd | Torrisholme |
| Obras Construction | Whitehaven |
| OBrien Electrical Ltd | Dinas powys |
| Obsession design and build ltd | Somerset |
| Obsidian Interiors | Obsidian Kitchens and Bathrooms, 41- 47 Fairview Rd, Cheltenham, Gloucestershire |
| Obsidian ME LTD | Gravesend |
| Obsidian Roofing Ltd | Kilburn |
| obtest | Wilmslow |
| OC Electrical | Cullompton |
| OC Homes | Greater london |
| OC Landscaping and Driveways | Bilston |
| OC Plumbing & Gas Limited | Welwyn Garden City |
| OC Security | Woking |
| OCB Ltd | Caterham |
| OCC Construction | Gateshead |
| OCD Plastering | Warwick |
| OCD Services Kirklees Ltd | Huddersfield |
| Ocdongroup Painters | Somercotes |
| Ocean | Bristol |
| Ocean 9 Contracting Ltd | Colchester |
| Ocean Bathrooms and Kitchens | 28 Avery Close, Warrington, Cheshire |
| Ocean Bond Services LTD | Hornchurch |
| Ocean City Cleaning | Plymstock |
| Ocean Construction | Paignton |
| Ocean Contractors | Gillingham |
| Ocean Electrical | Camelford |
| Ocean Electrical Installations | Marlow |
| Ocean Electrical Services | Exeter |
| Ocean Electricals | London |
| Ocean Electrics South West Ltd | Plymouth |
| Ocean Estate Agents | Bristol |
| Ocean Estate Agents | Bristol |
| Ocean Estate Agents | Bradley stoke |
| Ocean Estate Agents | Bristol |
| Ocean Estate Agents | Bristol |
| Ocean Estate Agents | Bristol |
| Ocean Estate Agents | Bristol |
| Ocean Estate Agents | Bristol |
| Ocean Housing Ltd | St. austell |
| Ocean Interiors | Walsall |
| Ocean Letting and Management | Bristol |
| Ocean Letting and Management | Bristol |
| Ocean Letting and Management | Bristol |
| Ocean Letting and Management | Bristol |
| Ocean Letting and Management | Bristol |
| Ocean Letting and Management | Bristol |
| Ocean Plasterers Ltd | London |
| Ocean Plumbing & Heating | Hitchin |
| Ocean Plumbing Limited | Gerrans |
| Ocean Plumbing Services | Redruth |
| Ocean Properties | Devon |
| Ocean Property Cornwall | Looe |
| OCEAN VIEW WINDOWS LTD | Plymouth |
| Ocharo Builders | Ilford |
| Ochiltree Bespoke Joinery Ltd | Hexham, Northumberland |
| Ochilvale Engineering Ltd | stirling |
| Ocho Designs Ltd | Merseyside |
| Ochre Kitchen | Kettering |
| Ockbrook Fencing | Derbyshire |
| Ockelton Electrical Contractors Ltd | Hessle |
| OCO Home Solutions | Berkshire |
| OCS M&E Services | Lochee |
| OCS UK&I Limited | London |
| OCS UK&I Limited | Loanhead |
| Octagon Construction Ltd | Rhyl |
| Octagon Electrical Contracts Ltd | Harlow |
| Octagon Shopfitting & Building Services Ltd | Surrey |
| Octarch Decoration Services | Staines-upon-thames |
| Octavia Housing | London |
| Octavius Electrical Solutions Limited | Brentwood |
| Octopus Energy Services Ltd | Kemptown |
| Octopus Energy Services Ltd | London |
| Octopus Plumbing | Mitcham |
| Octopus Services Ltd | Wakefield |
| OCU Northavon Group Ltd | Taunton |
| OCU Northavon LTD | South molton |
| OD Contractors Ltd | Huddersfield |
| OD Electrical Contracting Ltd | Waltham chase |
| OD Electrics Ltd | London |
| ODA Electrical Ltd | Oldbury |
| Odaf Eco Services Ltd | Killingworth |
| Odd Jobs With John | Gainsborough |
| Oddjobs Gardening Services | Mountain ash |
| Odette Funeral Director Ltd (Calne) | Calne |
| Odin Electrical Services Ltd | Loughborough |
| Odm decorators | Bromley |
| ODM Electrical Services Ltd | Dungannon |
| ODML | London |
| odNOVA Aesthetics | Brighton |
| Odom Electrical Ltd | Oakham |
| Odriscoll Gas and Plumbing | Portsmouth |
| ODS Plastering Services | Pontypool |
| ODS Plumbing & Heating | Sheffield |
| ODS PLUMBING AND HEATING LTD | Harlesden |
| Odyssey Contracting Services Ltd | Dochgarroch |
| OEB Building Service Ltd | Wickford |
| OEB Building Service Ltd | Wickford |
| OEB Building Services Ltd | Wickford |
| OEC (Electrical) Ltd | Southampton |
| OEH Electrical | Bodorgan |
| OELEC | Deal |
| Oem Carpentry | Guildford |
| OES Installations Ltd | Wirral |
| OES Ormskirk Electrical Services LTD | Aughton |
| Ofcourse Plasterers Painters & Decorators | Jedburgh |
| Ofcourse Plasterers Painters and Decorators | Jedburgh |
| OFF ELECTRICAL SERVICES AND MAINTENANCE LTD | London |
| Off Grid Developments Ltd | Gillingham |
| Off Grid Life | Bishops tawton |
| Off Grid North West Limited | Preston |
| Off The Rock Landscaping Ltd | Edinburgh, Midlothian |
| Offa Construction Ltd | Wolton on Thames, Surrey |
| Offcuts Ltd | Suite 6, 206 New Road, Rickmansworth, Hertfordshire |
| Offen Heating | Hailsham |
| Office Compliance Management Ltd | Sheffield |
| Office House | Chelmsford |
| Office Removals London | 33 Lurline Gardens, Battersea, Greater London |
| Officelight Construction LTD t/a AC 4 Homes | Croydon |
| Official Cleaning Diamonds | Darnley |
| Officium Building Management Systems Ltd | Coulsdon |
| Offsite Solutions (RT) Ltd | Highbridge |
| OG Design Services | Essex |
| OG Electrical | Belper |
| OG Roofing | Hamilton |
| OGB Sussex Limited | Hove |
| OGDEN CONSTRUCTION & LANDSCAPE | Manchester |
| Ogden Electrical Services Ltd | Eastbourne |
| Ogee Restorations | Cleethorpes |
| Ogilvie Roofline | Dunfermline |
| Ogilvy & Sneyd | Leek |
| Ogilvy Property Services | Southampton |
| Ogle Electrics | Ashstead |
| Oglesby Nottm Ltd | Nottingham |
| OGV Electrical LTD | Bonnybridge |
| OGW LIMITED | Burghill |
| Oh so beaut | Belfast |
| OH Tree Services | Hedgehog Cottage, Hazelrigg Lane, Bridge, Ulverston, Newby Bridge, Greater London |
| OHA Electrics Ltd | Whitley bay |
| Ohana Aesthetics & Beauty | Kings Langley |
| Ohanaa Bathrooms | Buckinghamshire |
| Ohanaa Ltd | Slough |
| OHD & Build | South Petherwin |
| Ohm & Safe Electrical Ltd | Croydon |
| Ohm Boys Electrical | Sheffield |
| OHM Electrical Engineering Ltd | Ilford |
| OHM Electrical Installations Limited | Cannock |
| OHM Electrical Services Ltd | Rochdale |
| OHM Electrics | Newport |
| Ohm Electrics Ltd | Milton keynes |
| OHM Gas Heating and Plumbing Ltd | Sudbury |
| Ohm Improvements | Waterlooville |
| OHM Repair | Rickmansworth |
| Ohm Work Ltd | Harlow |
| Ohm-Elec Ltd | Bovingdon |
| OHMATIC ELECTRICAL LTD | Mitcham |
| Ohmega Contractors Ltd | Abbots Langley |
| Ohmega Electrical Ltd | Batley |
| Ohmega Services Ltd | Carshalton |
| Ohmic Electrical Services Ltd | Lightwater |
| Ohms and Watts (services) Ltd | Hemel hempstead |
| Ohms Electrical Contracting Ltd | Seddul Bahr Industrial Estate, Southampton, Hampshire |
| Ohms Electrical Contracting Ltd | Bitterne |
| Ohms Electrical Services Ltd | Henley-in-arden |
| Ohms For Homes | Hastings |
| Ohms Group Ltd | Aylesford |
| Ohmtech Electrical Installations CC Longhurst T/As | Kent |
| Ohmz Electrical | Nuneaton |
| Ohs Oil Heating Services | Radstock |
| Oico Home | London, Greater London |
| Oil Boiler Repair | Wickford |
| Oil Facilities Ltd | Vale of glamorgan |
| Oil Heating Specialist | Scarborough |
| Oiltech Heating | Woodbridge |
| OIS Removals Limited | Tooting |
| OJ Carpentry | Hook |
| OJ Electrical | Spennymoor |
| OJ ELECTRICAL SERVICES LTD | Rayleigh |
| OJ Landscapes | Somerset |
| OJ Poole Electrical Services Ltd | Harpenden |
| OJAYS | Ashford |
| OJC Electrical | Bristol |
| OJF Electrical Services | Manby |
| OJN Electrical | Dartford |
| OJS Electrical | King's Lynn |
| OJS Electrical Services | Enfield |
| OJS Electrics | Aylesbury |
| OJS ostlers joinery services | kingston upon hull |
| OJS Services Ltd | Langton Green |
| OJT Electrical Limited | Manchester |
| Ok custom clean | Slough UK |
| Oke Electrical | Berkshire |
| Oktav Projects Ltd | St. albans |
| OKTO | Lisburn |
| OL & Edward Ltd | London |
| OL AND EDWARD LTD | 142 Cromwell Road, London |
| Ola Derm Clinic | Dunfermline |
| Olabisi Adeola | Bradford |
| Olaf Construction | Greater London |
| Old Briar Property Services | Thatcham |
| Old City Carpentry and Construction | Margate |
| Old English Paving Ltd | Stourport-on-Severn |
| Old English Paving Ltd | Worcestershire |
| Old English Tiling | The Ridgewaye, Tunbridge Wells |
| Old Forge Woodcraft | Looe |
| Old Oak Carpentry Ltd | Southampton |
| Old Oak Kitchens | Carmarthenshire |
| Old Park Plumbing & Heating | Devon |
| Old School Builders | Stevenage |
| Old Stratford Renovations LTD | Cosgrove |
| Old Swan Gas Services | Stoneycroft |
| Old timers plastering. Drylining. Damp roofing co. | Bournemouth |
| Old Town Electrics Ltd | Eastbourne |
| OLD WORLD PLASTERING | Leathehead |
| Olde English Tiles | Olde English Tiles, Rawmec Business Park, Plumpton Road, Hoddesdon, Hertfordshire |
| Oldfield and Sons Limited | Rotherhithe |
| Oldfield Bathrooms and Kitchens Limited | 82 Bury New Rd, Bolton, Lancashire |
| Oldfield Construction | London, Greater London |
| Oldfield Electrical Services | Maidenhead |
| Oldfield Smith & Co | East sussex |
| Oldfield Smith & Co | Gatwick |
| Oldfield's Gas & Plumbing | Worksop |
| Oldham Aerials and Security | Oldham, Greater Manchester |
| Oldham Cleaning Co | Oldham |
| Oldham Roofers | Oldham, Lancashire |
| Oldham Roofing Company | Rochdale |
| Oldham Roofing Company Limited | Heap |
| Oldknow Contracting Ltd | Chesterfield |
| Oldland Electrical Services Ltd | Bristol |
| Oldrey Electrical Services | Wootton wawen |
| Oldroyd Electrical | Holmfirth |
| Oldway Electrical Services Ltd | Paignton |
| Oldwest Maintenance Ltd | Neasden |
| Olea Landscapes Ltd | London, Surrey |
| Olea Landscapes Ltd | Surrey |
| Oleary & Son Build & Design | Tadworth |
| Oleco | Beaumaris |
| Oleksiy Matsehorin | Carshalton |
| OLEKSIY SLOBODYANYK | Bexley |
| Olga Ashby Interiors | Greater London |
| OLI HOME IMPROVEMENTS | Gerrards Cross |
| Oli Jones Engineering | Bitterne |
| Oli-Gas | Manchester |
| Olia's Plumbing and Heating | London |
| Olidecor | Peterborough |
| OliGas Ltd | Porthcawl |
| Oligra Renovations Ltd | Kent |
| Olimpiu Balaban | Edgware |
| Olimpiu Carp Petrache | London |
| OLIRU Developments Ltd | Kirkburton |
| Olis Hay Kent Limited | Sittingbourne |
| Olive Beauty & Aesthetics | Milton Keynes |
| Olive Building Ltd | Wickford |
| Olive Builds | London |
| Olive Electrical Services Limited | Wigston |
| Olive Grove Home Ltd | Surrey |
| Olive Roofing & Property Maintenance Limited | Wellingborough |
| Olive Roofing & Property Maintenance Limited | Wellingborough |
| Olive Security Ltd | London |
| Oliver & Bailey | Bexhill-on-sea |
| Oliver & Bailey | Hastings |
| Oliver & James Funeral Directors | Oxfordshire |
| Oliver & James Funeral Directors | Oxfordshire |
| Oliver & Philips Electrical Services Ltd | Dudley |
| Oliver Barton Plumbing and Heating | Bristol |
| Oliver Brace Electrical Contractor | Saundersfoot |
| Oliver Brooks | Lancing |
| Oliver Brooks Limited | |
| Oliver Brown Electrician | Camberley |
| Oliver Building Services Ltd | St Albans |
| Oliver Burn | London |
| Oliver Burn | London |
| Oliver Clayton Painting Services | Buxton |
| Oliver Clayton Painting Services | Buxton |
| Oliver David Construction and Renovation | Tunbridge Wells |
| Oliver Evans and Sons | Dyfed |
| Oliver Fox | Buxton |
| Oliver Hale Electrical Ltd | London |
| Oliver Hazael | Bath |
| Oliver Hazael Bespoke Carpentry and Plastering | 11 Charlcombe Way, Bath, Somerset |
| Oliver Heating | Sutton |
| Oliver Henry Bespoke Kitchens and Interiors | Derbyshire |
| Oliver Howard | Coventry |
| Oliver IGD Ltd | Stockport |
| Oliver J Knapman Funeral Service (Teignmouth) | Teignmouth |
| Oliver Jacobs Ltd | London |
| Oliver James Gardening Company | Twickenham, Greater London |
| Oliver James Landscapes | Church Road, Northwood, Middlesex |
| Oliver Jaques | London |
| Oliver Kendrick | Carlisle |
| Oliver Laing | Truro |
| Oliver Lambert | Alnwick |
| Oliver Laurence Electrical Contractor | St. albans |
| Oliver Ling | Wolverhampton |
| OLIVER LITA CONSTRUCTION LTD | London |
| Oliver Meadows [Kitchens & Interiors] | Bedfordshire |
| Oliver Minton Estate Agent | Ware |
| Oliver Minton Estate Agent | Harlow |
| Oliver Partridge | Iver |
| Oliver Pro Maintenance | London |
| Oliver Quarton Plumbing & Heating | York |
| Oliver Reilly Estate Agents | Newark |
| Oliver Richards | The Stukeleys |
| Oliver Roger Plumbing & Heating | Broadstairs |
| Oliver Russell Electrical Ltd | Unit 3 Cadwell Lane,, Hitchin, Hertfordshire |
| Oliver Russell Electrical Ltd | Hitchin |
| Oliver Sharpe | Westcliff-on-sea |
| Oliver Smith | Sandridge |
| Oliver Smith Building Contractor | Cambridge |
| Oliver Smith Electrical Limited | Skipton |
| Oliver Stacey Painter & Decorator | Thames Ditton |
| Oliver Towle Ltd | Louth |
| Oliver Trim Electrical | Welwyn |
| Oliver Wild Ltd | 9 Moor Valley Close, Sheffield |
| Oliver's Painting & Cleaning | Cramlington |
| Oliver-Ricci | Cheshire |
| Olivers Electrical | Somerset |
| Olivia Jacobs | Erith |
| Olivia Louise Aesthetics and Beauty | Croydon |
| Olivia's Place Dog Grooming Service | Northumberland |
| Olivias Aesthetics Limited | Penn |
| Oli’s Joinery | Culloden |
| oljord | Wiltshire |
| Ollerton Electrical Engineering | Camborne |
| Ollie Electrical | Holbury |
| Ollie Howick Electrical | Malvern |
| Ollie Parker Electrical | Wrexham |
| Ollie Pinner Electrical | Boston |
| Ollie Roofing & Building Contractors | Campsie View, Annathill, Coatbridge, North Lanarkshire |
| Ollie's Lock & Safe Locksmiths | Cheltenham |
| Ollington Electrical | Newmarket |
| Ollmec Ltd | Motherwell |
| Ollsten Ltd | Churchbridge |
| Olly London Worktops | Morden |
| OLS Gardening Services | Oldham |
| Olseen Electrical Ltd | Broxbourne |
| Olseen Roofing Ltd | Barnet |
| Olton Builders | Solihull |
| Olton Tiling Services | Solihull |
| Olusola Services Ltd | Winson Green |
| Olver Electrical Contractors Ltd | Callington |
| Olwyn Fox (2000) Ltd | Leeds |
| Olympia Electrical LTD | Plymouth |
| Olympia interiors | Clophill |
| Olympia Projects Limited | Leeds |
| Olympia Removals Birmingham | Blackthorn House, St Paul's Square, Birmingham, Birmingham, West Midlands |
| Olympia Removals Leicester | 6 St George's Way, Leicester, Leicestershire |
| Olympia Removals Nottingham | City Gate East, Tollhouse Hill, Nottingham, Nottinghamshire |
| Olympia Removals Southampton | 15 Rockstone Pl, Southampton, Hampshire |
| Olympian Water Gardens | 18 Lower bank, Denton, Manchester, Lancashire |
| Olympic Construction Limited | Lancashire |
| Olympic Electrical Services | Plympton |
| Olympic Gas | Sutton coldfield |
| Olympic Plumbing & Heating | West Huntspill |
| Olympic Plumbing & Heating | Somerset |
| Olympic plumbing and bathrooms | Greater London |
| Olympus Automation Ltd | Peterborough |
| Olympus Construction | Farnborough |
| Olympus Construction Services LTD | 15 Loscombe Meadow, North Curry, Taunton, Somerset |
| Olympus Electrical | London |
| Olympus Mechanical Services Ltd | North East Ipswich |
| Olympus Roofing Ltd | Dorset |
| OLYNPAIDD M & E 2008 LTD | Barry |
| Olynpaidd M&E 2008 Ltd | Barry |
| OM Electrical | Ulverston |
| OM Electrical Engineering Limited | Colindale |
| OM Electrical Services Ltd | Stevenage |
| OM Handyman Services | Dudley |
| OM Plumbing & Heating | Solihull |
| Oman Electrical Services | Buttershaw |
| Omar Electrical & Plumbing Ltd | Manchester |
| Omar Electrical & Plumbing Ltd | Manchester |
| Omar Mughal | Kings Heath |
| Omar Park Homes Ltd T/A Regal Leisure Homes | Dorset |
| Omargasandplumbing Ltd | Washwood Heath |
| OMD Electrical Services | Littledown |
| Omedex Ltd | Wembley |
| Omega 1 Electrical Ltd | Meopham |
| Omega Drives and Patios Ltd | Chalfont St. Giles |
| Omega Drives and Patios Ltd | Cambrigde Central South |
| OMEGA ELECTRICAL | Witney |
| Omega Electrical | Surrey |
| Omega Electrical Contractors | Clitheroe |
| Omega Electrical Contractors (CRT) Ltd | Evesham |
| Omega Electrical Contractors (Scotland) Ltd | South lanarkshire |
| Omega Electrical Contractors Ltd | York |
| Omega Electrical Engineering Services | Famet Close, Purley, Surrey, |
| Omega Electrical Northwest Ltd | Peel road |
| Omega Electrical Services | Wigston |
| Omega Electrical Services | London |
| Omega Funerals Ltd (Great Barr, Birmingham) | Birmingham |
| Omega Group | Northolt |
| Omega Group Construction Ltd | Prescot |
| Omega Home Improvements | Darlington |
| Omega Kitchen Installations | Wiltshire |
| Omega Laser Aesthetics | Wokingham |
| Omega Mechanical and Electrical Lim | Fareham |
| Omega Plastering & Building Ltd | Great Sankey |
| Omega Plastering & Building Ltd | Warrington |
| Omega Plumbing Ltd | Clapham |
| Omega Plumbing Ltd | London |
| Omega Roofing | Wiltshire |
| Omega Roofing & Cladding | Cambrigde Central South |
| Omer | Slough |
| omer_faruk47 | Glasgow |
| OMES Installations LTD | Whitstable |
| OMG Plumbing and Gas | Hertfordshire |
| OMH Electrical Limited | Coggeshall |
| OMH Plumbing And Heating | Birmingham |
| OMJ Property Services Ltd | PORTSMOUTH |
| OML Plastering | Peterborough |
| Omni Bathrooms | Leicestershire |
| Omni Electrical Services | West molesey |
| Omni Plumb | Kemptown |
| Omni Plumbing & Heating Services | St helier |
| Omni Plumbing and Heating LTD | West yorkshire |
| OMNIA Electrical Solutions Ltd | Warrington |
| Omnia Property Services | Portishead |
| Omnia Technical Services Ltd | Willaston |
| Omniform | Greater London |
| Omnious Construction Ltd | Staines-upon-thames |
| Omnis Developments Ltd | Merseyside |
| Omniscient Building Service Ltd | Southall |
| Omnivista Glass Ltd | Greater London |
| Omnivolt Electrical Services | Tillybody |
| OMP Building Services Limited | Essex |
| OMP Electrical | Whitchurch |
| OMS Electrical | Sible Hedingham |
| Omstrad Limited trading as Electrical Labs | Worksop |
| Omurca Ltd | Edenbridge |
| Omurca Ltd | Edenbridge |
| OMW Designs | Surrey |
| On | Harrow |
| On Command Automation & Electrical | Isleworth |
| On Command Automation Electrical | Holloway |
| On Command Electrical | Brixton |
| ON COURSE ELECTRICAL SERVICES LTD | Cricklewood |
| On Cue Builders | Garw Valley |
| On Cue Builders | Bridgend |
| On Electrical & Fire Alarm Ltd | Enfield |
| On Electrical Contractors & Services Ltd Services Ltd | Hyde |
| On Electrical Kent LTD | Dover |
| On Facades | Ruislip |
| On Home Ltd | Boston |
| On Line Facilities Management Ltd | Southampton |
| On Off Electric Works | Birmingham |
| On Point Construction | Skegness |
| On Point Electrical Services South Ltd | Southampton |
| On Point Electrical Solutions Ltd | Weybridge |
| On Point Electrics Ltd | Cannock |
| On Point Installations Ltd | Tamworth |
| On Point Plastering | Sturminster newton |
| On Point Property Services | Earley, Reading |
| On Security | Emerson Park |
| On Site Generation Ltd | Mid lothian |
| On Site Plumbing & Electric Ltd | Barking |
| On Site Service (UK) Ltd | Leicester |
| On Site Services | Surrey |
| On Site Services | Sunbury-on-Thames |
| On Tap | Margate |
| ON TAP Plumbing & Heating | Goonhavern |
| On the Boundary Fencing | Aylesbury |
| On The Go Electrical | Warwickshire |
| On The Go Removals | Unit 20, Midway Business Centre, Clay Cross, Chesterfield, Derbyshire |
| On The Level Building Services | Aylesbury |
| On the move | Bradford |
| On the Move | Branston |
| On the Tiles | Sunderland |
| On Time | Bradford |
| On Time Onslow Services | London |
| On Top Landscaping LTD | Woking |
| On-Demand Building Services | Canterbury |
| ON-EV | Chester |
| On-Load Systems Limited | Northampton |
| On-Power Electrical & Mechanical Ltd | Cannock |
| On-Power Electrical and Plumbing Ltd | Birley |
| On-X Electrical Limited | Chatham |
| ON. Electrical Solutions | Stoke-on-trent |
| Oncall | Wrightington |
| Oncert LTD | Bexhill-on-sea |
| Onco S E S Ltd | Birmingham |
| One 4 All Cleaning Services | bournemouth |
| One 4 All Roofing & Building Contractors | Newtownabbey |
| One 4 all solutions in na Ltd | Livingston |
| One Agency | Staffordshire |
| One Box Solutions | Maidstone |
| One Build | Penarth |
| One Call | Radford |
| One Call Bathrooms | Hertfordshire |
| One Call Building Services (Herts) Ltd | South mimms |
| One Call Cleaning and Gardening Ltd | Kent |
| One Call Electrical | Bromley |
| One Call Electrical Services Ltd | Canterbury |
| One Call Electricians Ltd | Southall |
| One Call for Plumbing, Heating & Gas | Nuneaton |
| One Call Gas Services ltd | CANTERBURY |
| One Call Insurance Services Ltd T/A One Call Maintenance | Doncaster |
| One Call Landscapes | Nottinghamshire |
| One Cap Electrical Services Ltd | Grimsby |
| One click contractors ltd | Milton keynes |
| One Coat Plastering | Whitstable |
| One Construction & Interiors Ltd | Rockwood, Great Missenden, Buckinghamshire |
| One Contractors | Wokingham |
| One Design Electrical Ltd | Livingstone |
| One electrical | Northampton |
| One Electrical Contractors | Newark |
| One Electrical Group Ltd | Beverley |
| One Electrical Services | Belfast |
| One Electrical Solutions | Cheshire |
| One Electrical Solutions | Appleton |
| One Electrical Test and Inspection Ltd | Kent |
| One Facility Ltd | Stevenage |
| One Goddon Electrical Services | Downham market |
| One Goddons Electrical Services | 12c Railway Road, Downham Market, Norfolk |
| One L Building Services | London, Greater London |
| One Manchester | rdwick |
| One MEP Ltd | Hatton Garden |
| One Move Group | London |
| One Perfect Solution Ltd | London |
| One Point Services Ltd | Stratford |
| One Point Services Ltd | London |
| One Removal | Hidcote Gardens, London, Greater London |
| One Response | London |
| One Sales and Lettings | Derby |
| One Solution Construction | Epsom |
| One Source Electrical Ltd | Maidstone |
| One Spark Electrics | Brixton |
| One Staff Solution Ltd | London |
| One Step Electrical Ltd | Wandsworth |
| One Step Installations | Wrexham |
| One Sterling Carpentry & Building Services | Suite 6, Websters Court, Rayleigh, Essex |
| One Stop Building and Property Solutions Ltd | Bradley |
| One Stop Construction | Livingston |
| One Stop Driveway Specialists | Gravesend |
| One Stop Electrical | Rippondean |
| One Stop Electrical Solutions | Redcar |
| One Stop Handyman | Teddington |
| One Stop Joinery Ltd. | Caldyne Park, Wallage Lane, Rowfant, West Sussex |
| One stop plumbing | Leigh |
| One Stop Plumbing & Heating Ltd | Erdington |
| One Stop Plumbing & Heating Ltd | West Bromwich |
| One Stop Roofing | Bridgnorth |
| One Stop Worktops Ltd | Stockport, Cheshire |
| One Up Plastering Ltd | Edinburgh |
| One Way Group Limited | Stoke on trent |
| One Way Roofing Ltd | Worcester Park |
| One Will Electrical and Building | London |
| One X Electrical Limited | Herne bay |
| One's Decorator | London |
| One-Stop Appliance Repairs Ltd | Caerffili |
| One10 Electrical Contractors | Frizinghall |
| One2 lofts & extensions ltd | Ilford- seven kings |
| One20 Consulting Ltd | Southport |
| One4gas | Cambridgeshire |
| Onea Business Solutions | Kidlington |
| Onecall Plumbing & Heating | Coventry |
| Onecall roofing contractors LTD | Northampton |
| Onecall Solutions Ltd | Albury |
| Onedesignandmoore | Cambridge |
| OneElectricalmk | Milton Keynes |
| OneHeat | Barnsley |
| ONeil Coatings | Irvine |
| ONeil Plumbing & Heating Ltd | Bromham |
| Oneill Electrical Installations LTD | Esher |
| Oneill gas | Mexborough |
| OneOak Landscapes | Billericay, Essex |
| Onesec Electrical & Security Ltd | Kirkby |
| Oneshot Services | Orpington |
| Onestick Interiors | Hereford |
| Onesto Heating Services | Chineham |
| Onestop gas | Newcastle |
| OneStop Heating Services Ltd | Rush Green |
| Onestop Services | London |
| OneVolt LTD | Uppermill |
| OnFlo - Plumbing & Heating Services | Durham |
| Ongas | Woodchester |
| Ongas Guildford Ltd | Woking |
| Ongo Homes Ltd | Scunthorpe |
| ONIC Electrical Ltd | Maidstone |
| Onivas Heating | Earley |
| Onix Systems Ltd | Baldock |
| Online Payment Service Tax | Clinton, Londonderry |
| Online Windows | LANCASTER |
| Online Worktops | North West, Cheshire |
| Only Bathrooms & Building | Islington |
| Only Development Company Ltd | Bromley |
| Only Electrical | Poole |
| Only Floors | Royston |
| Only Lifts Ltd | Bexhill-on-Sea, East Sussex |
| OnlyCerts. Ltd | Shirley |
| ONLYOU Clinic | Bristol |
| ONN building ltd | Edgware |
| Onpoint Building Services Ltd | London |
| Onpoint Electrical | Cannock |
| OnPoint Heating | Worcester |
| Onpoint Plastering | Dartford |
| OnPoint Roofing & Building Ltd | London, Greater London |
| Onsite Contractors & Plumbing Ltd | London |
| Onsite Electrical Limited | Harrow |
| Onsite Electrical Services | Wallington |
| Onsite Finishers Ltd | Milton keynes |
| Onslows | London |
| Onstruction Ltd | London |
| Ontime Building Contractors Ltd | London |
| Ontime Gas and Heating Ltd | Birmingham |
| Ontime Plumbing | Dudley |
| Ontrack Computers LTD | Ontrack Computers Ltd, Unit 23 Monkspath |
| Ontrack Electrical Ltd | St. helens |
| OnTrack Heating | Bordon |
| Ontrack Infrastructure Solutions Ltd | Clifton |
| Ontrack Paving | Maidenhead |
| Ontrax Construction | Stowmarket |
| Onward Repairs Ltd | Accrington |
| Onwood Decor | Westbury |
| Onyx | Porth |
| Onyx Construction (Kent) Ltd | Whitstable |
| ONYX ELECTRICAL (NW) LTD | Darwen |
| Onyx Electrical Engineering | Widnes |
| ONYX Heating & Plumbing | Gants Hill |
| Onyx Heating and Plumbing LTD | Regent Street |
| Onyx Iv | London |
| Onyx Plumbing & Heating | Maidstone |
| Onyx Plumbing Ltd | Rayleigh |
| Ooanda Expert Cleaners | Harpurhey |
| OoshhStudio | Hertfordshire |
| OPAL AESTHETICS | Leeds |
| Opal Aesthetics Ltd | Bridlington |
| Opal Decor | Solihull |
| Opal Electrics Ltd | Greenford |
| Opal Living Ne Ltd | Hesleden |
| Opalco | Witney |
| Opc Brickwork Ltd | Bournemouth |
| Open All Hours | London |
| Open Doors | Buckingham |
| Open Estates | Radlett |
| Open House Estate Agents, Aberdeen | Aberdeen |
| OPEN INTERIORS LTD | Sutton Coldfield |
| Open Mind Building Services Ltd | Bushey |
| Open Plan Renovation | Essex |
| Open Removals | Market Drayton |
| Open Sky Garden Services | Newmarket |
| Open Space Construction Ltd | St albans |
| Open Space London | London, Greater London |
| Open-In Security | Ickenham, Uxbridge |
| Openreach Ltd | Croydon |
| Openshaw Living | Essex |
| OpenSquare Glazing and Design Limited | Buckinghamshire |
| Openview Security Solutions Ltd | Romford |
| Operation Landscapes | Hampshire |
| Oppro Ltd | Snodland |
| Opta Plumbing and Heating Services Limited | |
| Optama Ltd | Glasgow |
| Optec Electrical Services LTD | Westcott aylesbury |
| Optech Electrical (a division of Optech) | Barrow-in-furness |
| Opti-Gas | Stoke |
| Optima Electrical Services Ltd | Goodrington |
| Optima Leodis Ltd T/A Optima Electrical | Leeds |
| Optima Property Services | Bristol |
| OPTIMAL Beauty & Training | Wolverhampton |
| Optimal Comfort Plumbing and Heating | Chessington |
| Optimal Electrical | Hants |
| Optimal Electrical Solutions Ltd | G71 7uu |
| Optimal Interiors | Maidstone |
| Optimal Plastering | Bexley |
| Optimal Plastering | Bexley |
| Optimal Roofing Ltd | Chester |
| Optimal Utility | Ellon |
| Optimise Electrics | Boverton |
| Optimise Group Ltd | Wickford |
| Optimise Group Ltd | Wickford |
| Optimised Heating | Raasay, Henley Lane, Kingsdown, Corsham, |
| Optimize Gas & Plumbing | Thornton Heath |
| Optimize Plumbing & Heating Ltd. | Sutton |
| Optimo Electrical Services Ltd | Cannock |
| Optimum Building Solutions Ltd | Bognor Regis |
| Optimum Decor | Morecambe |
| Optimum Developments Ltd | King's lynn |
| Optimum Electrical Engineering Ltd | Stockport |
| Optimum Electrical Ltd | Bexley |
| Optimum Electrical Testing Ltd | Thornton Heath |
| Optimum Electrics Ltd | Market deeping |
| Optimum Guarding Ltd | Leicester Square |
| Optimum Heating & Plumbing | Birmingham |
| Optimum Home Electrics | Telford |
| Optimum Maintenance Solutions LTD | Chester |
| Optimum Mechanical & Electrical Ltd | Huddersfield |
| Optimum Plastering | Chalfont St Peter |
| Optimum Plumbing & Heating Limited | Cambridgeshire |
| Optimum Prime Gas Services | Perry Barr |
| Optimum Property Services | Hove |
| Optimum Renovation | Greater London |
| Optimum Services EM Ltd | Leatherhead |
| Optimumbms Ltd | Dumbarton |
| Optimus Build Solutions | Romford |
| Optimus Electrical Contractors Ltd | Melksham |
| Optimus Electrics | Burgess hill |
| option construction | Essex |
| Options Electrical Services Ltd | Bristol |
| Options Home Extensions | Bicester |
| Options Home Extensions (Oxfordshire) | Oxfordshire |
| Optma Builders ltd | 25 Endersby Road, Barnet |
| Optus Projects Ltd | Bristol |
| Optyc Electrical Solutions | Erith |
| Opulence Plumbing and Heating | Four Heatons |
| Opulent Health Ltd | Aberdeen |
| Opulent Home Interiors | Chadwell Heath |
| Opus Air Conditioning (Sales) Ltd | Dartford |
| Opus Electrical Solutions Limited | Middlewich |
| Opus MP | Newburn |
| Opus Property Ltd | Weston super mare |
| Opus-4 Logisitics Ltd | Deansgate |
| OPUSFMGROUP LIMITED | Co4 9at |
| OQIDOS Engineering | Portsmouth |
| OR Electrical Ltd | Gwynedd |
| OR Plumbing | Kidderminster |
| Oraanj Construction LTD | Bushey Heath |
| Oracle Aesthetics | Carlisle |
| Oracle Energy Limited | Plymouth |
| Oracle Mechanical and Electrical Ltd | Leeds |
| Oracy Ltd | Sheffield |
| Oram Management | Stockbridge |
| Orama Electrical Limited | Rochdale |
| Orama Group Ltd | London |
| Orange Electrical Contractors Ltd | Solihull |
| Orange Electrical Ltd | Harrogate |
| Orange Fox Electrical Limited | Guestwick |
| Orange Fox Electrical Ltd | Foxes Office, Foxes Meadow, Reepham Road, Guestwick, Norfolk |
| Orange Fox Electrical Ltd | Guestwick |
| Orange Grove Construction Ltd | Hengoed |
| Orange Property Services | Kent |
| Orange Tree Electrical Services Ltd | Doncaster |
| Orange22 Ltd | Brighton |
| ORB Electrical | Hanham |
| ORB Electrical Services | Honiton |
| Orbis Electricals | Merton |
| Orbis Engineering Services Ltd | Stafford |
| Orbis Services Ltd | Inverness |
| Orbit Builders Service | LONDON |
| Orbit Construction Ltd | Westerham |
| Orbit Electrical Services Ltd | Aldermaston |
| Orbital Electrical Ltd | Slough |
| Orbital Electrical Services LLP | Launceston |
| Orbital Gas Services Ltd | London |
| Orbital Gas Services Ltd. | 40 Willoughby Road, London, Greater London |
| Orbital Heating & Plumbing | Haydon Wick |
| ORBITAL PROPERTY SOLUTIONS LIMITED | Kings Heath |
| Orca Electrical Ltd | Bristol |
| Orca Plumbing & Heating Ltd | Crawley |
| Orca Professional Services Ltd | Pattingham |
| Orca Renewables | Bristol |
| Orchard Building Services | leominster, Herefordshire |
| Orchard Carpentry | Surbiton |
| Orchard Carpentry | Surbiton |
| Orchard Cooling Ltd | Maidstone |
| Orchard Drives & Patios Limited | Kent |
| Orchard Electrical | Guildford |
| Orchard Electrical | Stowmarket |
| Orchard Electrical | Portsmouth |
| Orchard Electrical Contractors Ltd | Lemsford |
| Orchard Electrical Services | Crediton |
| Orchard Electrical Services | Colchester |
| Orchard Electrical Solutions Ltd | Accrington |
| Orchard Electrical SW Ltd | St. austells |
| Orchard Estates | Stoke-sub-hamdon |
| Orchard Garage Limited | Kent |
| Orchard Park Home Improvements | Glasgow |
| Orchard Plastering | Canterbury |
| Orchard Plumbing Limited | Rochester |
| Orchard Sales | Bagshot |
| Orchard Services Ltd | Broadstairs |
| Orchard Side Garden Services | Westbury |
| Orchard Tiling Limited | Aylesford |
| ORCHARD TIMBERWORKS | Brighton |
| Orchestrate | 53 Webb's Road, London, Greater London |
| Orchid Aesthetics | Hove |
| Orchid Energy Ltd | Woking |
| Orchid Interiors | West yorkshire |
| Orchil Consulting Limited | Crieff |
| Ordermatic Carbon Reduction Ltd | Norfolk |
| Orestone Controls | Basingstoke |
| Orford Plastering & Building Services | Warrington |
| Organic Garden Maintenance | London |
| Organic Heating Ltd | Hertfordshire |
| Organise Your House | Welling |
| Organised Chaos | Daventry |
| orgdem cleaning services | leigh |
| Ori Electrical LTD | Cricklewood |
| Orient Electrical Contractors Ltd | Yarm |
| Oriental Property Management | Selly Oak |
| Origin Construction Limited | London, Surrey |
| Origin Construction Limited | Surrey |
| Origin Electrical | Grimsby |
| Origin Electrical and Mechanical Services Ltd | Ossett |
| Origin Electrical Services | Perth |
| Origin Heating Ltd | Addlestone |
| Origin Plumbing & Electrical Ltd | Honiton |
| Origin Renewable Solutions Limited | Ambleside |
| Origin UK Energy Services | Horsley |
| Original Features Restorations Ltd | 155 Tottenham Lane, London, Greater London |
| Original Grafter Ltd | Leicester Square |
| Original Landscapes | Dorset |
| Original Landscapes | SHERBORNE, Dorset |
| Original Pathways and Sons Limited | Isleworth |
| Original Roofing and Construction Ltd | Sidcup |
| Original Stone Driveways | Preston |
| Original Style | Sowton Industrial Estate, Falcon Road, Exeter, Devon |
| Original Tile | Keighley |
| Orio Electrical Services Limited | Shoreham-by-Sea |
| Orion | Ruislip |
| Orion | Stevenage |
| Orion Building Engineering Services Ltd | Hemel hempstead |
| Orion Electrical Services | Bury |
| Orion Electricals Ltd | London |
| Orion Retail Installations Ltd | Leicester |
| Orion Security | Preston-on-Tees |
| Orion TS Ltd | Cardiff |
| Orkney Islands Council | Hatston industrial estate |
| Orli Shuka | Finsbury |
| Orman Electrics | Shoreham-by-sea |
| Orman Electrics | East sussex |
| Orme Electrical Ltd | Grantham |
| Ormiston Electrical Services Ltd | Preston |
| Ormsby Electrical Ltd | Dunmow |
| Ormskirk Plumbing | Ormskirk |
| Ormsons | Higher walton |
| Ornamental Classics | Malvern |
| Ornsby Electrical Ltd | Sarisbury green |
| ORO Projects | Greater London |
| Oro Projects | 13 Radnor Walk, London, Greater London |
| Orobosa Imafidon | Birmingham |
| Orostream Air Conditioning Ltd T/A OAC Services | Crowborough |
| Orr Plumbing & Heating | Larkhall |
| Orrco | Falkirk |
| Orrell Electrics | Liverpool |
| Orrell Removals | Wigan |
| Orrys Shop | Essex |
| Orsen Plumbers | Dundee |
| Ortmanns Plumbing & Bathrooms | Tunbridge Wells |
| Orton and Wenlock Ltd | Great bentley |
| Orton Electrical | Doncaster |
| Orton Electrical Services Ltd | Wolverhampton |
| Orton Mechanical Services | Wolverhampton |
| ORVA Electrical Limited | Smarden |
| Orwell Carpentry & Building Ltd | Ipswich |
| ORWELL ELECTRICAL LTD | Langham |
| Orwell Paving & Landscapes Ltd | Ravenswood |
| Orycks Ltd | Peterhead |
| Oryx Heating Services | Leeds |
| OS Aesthetics | LURGAN |
| OS Electrical & Liftwell Services | Ilkley |
| Os Electrical Safety Ltd | lONDON |
| Osas Move Ltd | London |
| OSBI Electrical Services Ltd | Benfleet |
| Osbiston Electrical Services Ltd | Waltham abbey |
| Osborn Builders Limited | Colchester |
| Osborn Plumbing | Shoeburyness |
| Osborne & Reed Heating & Plumbing | Farcet |
| Osborne Building Services | Bridlington |
| Osborne Electrical Services | Goole |
| Osborne Electrical Services Ltd | Wimborne |
| Osborne Heath | Berkshire |
| Osborne Kitchen Installations | Birmingham |
| Osborne Painters & Decorators | Glasgow |
| Osborne Technologies Ltd | Barnsley |
| Osbornes | Farnborough |
| Osburn Plumbing & Heating | Whitley |
| Oscar Design | Surbiton |
| Oscar Heat & Plumbing Ltd | Stevenage |
| Oscar Renn | Foxbank Street, Manchester, Greater Manchester |
| Oscardecorator | HP14 3Q |
| Oscare Services Limited T\/A Oscare Wellness | Ashford |
| Oscars Estate Agents Ltd | Hull |
| Oscars Vip Close Protection Ltd | Birmingham |
| Oselton Building Services | Wisbech |
| Osense Ltd | Eastham |
| Osgood Decorators | Barnet |
| OSH Plumber and Electricians | London |
| OSHEA CONSTRUCTION LIMITED | London |
| Osiris Electrical Services | Dunmow |
| Oskat Properties Management Services | London |
| Oslo Plumbing and Heating | London |
| Osman Electrical Ltd | Slough |
| Osman Heating and Gas Services | Preston |
| Osman Plumbing & Heating | Bournville |
| Osman Plumbing & Heating Service Ltd | Slough |
| Osman Plumbing & Heating Services Ltd | Hounslow |
| OSP Electrical | London |
| Osprey Electrical | Oakham |
| Osprey Kitchens & Bathrooms | North Lanarkshire |
| Osprey Kitchens & Bathrooms | Dennistoun |
| Osprey Plumbing & Property Services | Dunfermline |
| Osprey plumbing and heating | Weymouth |
| Osprey Windows Ltd | Hawarden |
| OSS Electrical Ltd | Alvechurch |
| OSS Electrical Services Ltd | Leicester |
| Ossett Plumbing & Heating | Ossett |
| Ostler's Electrical and Plumbing | Chepstow |
| OSullivan ShopFitting Ltd | Cambridge |
| OSW Electrical | Bristol |
| Oswald Hughes (Electricals) Ltd | Seahouses |
| Oswestry and Wrexham Roofing Services | 1 The Old Shop, High Street, Weston Rhyn, Oswestry, Shropshire |
| Oswestry Heating | Oswestry |
| Oswestry Professional Tiling | Oswestry |
| Oswick Property Professionals | Halstead |
| Oszusci | London |
| OT Locksmiths & Carpentry | Coventry |
| Otec Gas and Plumbing Services Limited | Barnet |
| Otec Services Ltd | Southport |
| Otec Services Ltd | Ormskirk |
| OTF Facilities | Bristol |
| Otford Electrical Ltd | Sevenoaks |
| OTG | Tamworth |
| OTG Electrical Ltd | Leamington Spa |
| Other | London |
| OTI Design and Build Limited | Leicester |
| Otii Limited | Totteridge |
| OTIS Electrical Solutions | London |
| Otis Flame Heating | Aberdeen |
| Otley Funeralcare | West_yorkshire |
| OTM Carpentry Ltd | Surrey |
| OTS Elex | Uxbridge |
| Otter Electrical Ltd | Sidmouth |
| Otter Electrical Services | Budleigh Salterton, Devon |
| Otter Electrical Services Ltd | Budleigh salterton |
| Otter Valley Funerals Ltd | Devon |
| Otters Group Ltd | London |
| Ottewill Roofing | Cheam, Sutton |
| Ottley Lee | Bicester |
| Ottley Lofts Ltd | Southend-on-sea |
| Otto & Mensah Build | 15 Lambs Conduit Street, London |
| Otto Electrics | Leicester |
| Otto Gas and Plumbing | Birmingham |
| Otto Tiles & Design | London, Greater London |
| Ouali Chriqy powered by eXp | London |
| Oundle Electrical | Peterborough |
| Our Builders Ltd | London |
| Our Helpful Hands Ltd | Hammersmith |
| Our Helpful Hands Ltd | London |
| Our House Estate Agents | East riding of yorkshire |
| Our House Estate Agents Ltd | Hornsea |
| Our Plumber | Bury |
| Our Plumber | Beverley |
| Ouse Valley Land Care Specialists | Ditchling |
| Out of Hours Maintenance | Manchester |
| Out of the Blue Fabrications Ltd. | West Midlands |
| Out Of The Dark UK | Tyne and wear |
| Out on the Tiles Ltd | Chatham |
| Out the Box Removals | Brighton, East Sussex |
| Out There Living | Devon |
| Outdoor Creations | The Old Stables Office, Coney Lodge Farm, Park Farm Road, Birling, West Malling, Kent |
| Outer Limits Garden & Property Maintenance | Brentwood |
| Outer London returns | Erith |
| Outerscape | Berkshire |
| Outlook Building Services | Bishop's stortford |
| Outlook Energy Solutions | Prescot |
| Outlook Tree Care | Lytham st annes |
| Outlook Window Cleaning | Gloucestershire |
| Outlook Window Systems Ltd | Southampton |
| Outram Electrical Services Ltd | Oldham |
| Outside Inside | Swindon |
| Outside Inside Property Maintenance and Garden Services Ltd | West Sussex |
| Outsideology Limited | Dorking |
| Outward Gardens | Greater London |
| Outwood Interiors | Wakefield |
| Outwood Smart Home | 12 Alexander Drive, Bury, Greater Manchester |
| Ouzel Contracting | Dunstable |
| OV4 Dec Contracts | Motherwell |
| Oval Carpentry & Construction Ltd | Worthing |
| Oval Construction | Letchworth |
| Oval Construction | Hertfordshire |
| Oven Busters | Christchurch |
| Oven Clean Pristine | Barnsley |
| Oven Cura | Bradford |
| Oven Repairs R Us | Birmingham |
| Oven Sheen Ltd | Beckenham |
| Oven Shiners Limited | Whyteleafe |
| Ovenclean | Wickford |
| OvenFix | Surrey |
| Ovens n more cleaning services | Waterlooville |
| Ovenu | Sutton |
| Overall Building Ltd | Huntingdon |
| Overbrook Group | Mapperley |
| Overbrook Kitchens | Prestbury |
| Overcare Ltd t/a Openings | Dorset |
| Overcome With Emulsion | London |
| Overcomewithemulsion.com | 8 roebuck park, Alcester, Warwickshire |
| Overlay | Swanmore, Hampshire |
| Overleaf Garden Services Ltd | London |
| Overmass and Chapple (inc. S. J. Richards and Son Colyton) | Devon |
| Overton Electrical Services Ltd | Mansfield |
| OVERTON ELECTRICAL SERVICES LTD | Mansfield |
| Overton Electrical Systems Ltd | Reading |
| Ovidiu Capalna | Luton |
| OVO Energy LTD | Bristol |
| Ovolo Construction | Hertfordshire |
| Owain Smart Limited | Crymych |
| Owen & Palmer Ltd | Bangor |
| Owen & Son Builders Ltd | Exeter |
| Owen & Vines Building Services | Kent |
| Owen & White Electrical Ltd | Ely |
| Owen Baker Funeral Directors Ltd | Greater Manchester |
| Owen Bennett Building Services | Peterlee |
| Owen E Jones & Co (Maesteg) | Maesteg |
| Owen Electrical | Royston |
| Owen Electrical | Cardiff |
| Owen Electrical Contractors GC Ltd | Caernarfon |
| Owen Electrical Contractors Ltd | Birstall |
| Owen Electrical Services | Staines-upon-thames |
| Owen Electrical Solutions Limited | Rowlands castle |
| Owen EV Ltd. | Martock |
| Owen Jacobson | Belfast |
| Owen James Industrial Roofing | Plymouth |
| Owen Lyons | Grays |
| Owen Pooley Plastering | Moreton-in-marsh |
| Owen Refrigeration Ltd | Wellingborough |
| Owen Richards Plumbers | Carnforth |
| Owen Roberts Decorating | LONDON, Greater London |
| Owen Savage Painters | Beds |
| Owen Signature Kitchens | Holywell |
| Owen the Locksmith Limited | East sussex |
| Owen Thomas Garden Landscapes | Reading |
| Owen Van Services | London, Greater London |
| Owen Williams Kitchens | Leicestershire |
| Owen Williamson | Barrow In furness |
| Owens Appliance Repairs | Bognor regis |
| Owens Building Services | East Sussex |
| Owens Funeral Directors (Wirral) | Wirral |
| Owens Plumbing & Heating | Sowerby Bridge |
| Owl Carpentry & Joinery | telford |
| Owl Electrical Services Ltd | Shipley |
| Owl Electricians | Thornton-cleveleys |
| Owl Eyes F M | Nottingham |
| Owl Home & Garden Services | Lowestoft |
| Owl Plumbing and Building Company | Sutton |
| Owler Group Ltd | Oldham |
| Own Business | Southall |
| Own Removals & Storage | Kingston |
| Ox Repairs | Faringdon |
| Ox Roofing Services | Darwen |
| Ox Roofing Services | Darwen |
| OXATAN LTD | Romford |
| Oxbow Electrical Ltd | Easton |
| Oxbow Plastering Services | Bristol |
| Oxbridge Plumbing and Building | Mafeking, Weirs Orchard, Weirs Lane, Oxf |
| Oxenden Plastering Services | Stevenage |
| Oxenham's Paving & Landscaping | Exeter, Devon |
| OXF Electrical | Ipswich |
| Oxforce Tiling | Cowley |
| Oxford Brookes University FAO Steve Holt om | Oxford |
| Oxford Direct Services | Oxford |
| Oxford Edens | Kidlington |
| Oxford Electrical Installations Services Ltd | Witney |
| Oxford Electrical Solutions | Boars hill |
| Oxford Extensions | Oxford |
| Oxford Home Plumbing & Heating | Cowley |
| Oxford Installations | Bicester |
| Oxford Leak Detection Limited | Marston |
| Oxford Lighting & Electrical Solutions | Oxford |
| Oxford Lofts | Oxford |
| Oxford Man and Van | Oxford, Oxfordshire |
| Oxford Plumbing Services Ltd | Abingdon |
| Oxford Prestige Painting & Decorating | Kidlington |
| Oxford Removal Company | Horspath Industrial Estate, Peterley Rd, Oxford, Oxfordshire |
| Oxford Roofing and Leadwork Contractors | Abingdon |
| Oxford Solar PV | Oxford |
| Oxford Spires Electrical | Abingdon |
| Oxford West | London |
| Oxford's Absolute Gardening | Cambridge Terrace, Oxford, Oxfordshire |
| Oxfordshire Decorating Services | 21 Woodcote Road, Bicester, Oxfordshire |
| Oxfordshire Electrical Limited | Kidlington |
| Oxfordshire Electrical Services Ltd | Witney |
| Oxfordshire Electrics & Plumbing | Oxford |
| Oxfordshire Electrics & Plumbing Ltd | Oxford |
| Oxfordshire Garden Contractors | Oxfordshire |
| Oxfordshire Home Improvements | Oxfordshire |
| Oxfordshire Removals Man and Van Services | Oxford, Oxfordshire |
| Oxfordshire-removals Man & Van Services | Oxford |
| Oxhey F.S.E. Ltd | Watford |
| Oxin Electrical Ltd | London |
| Oxley Asphalte | Brighton |
| Oxley Electrical Ltd | Wakefield |
| Oxley Plumbing and Heating Limited | Byker |
| Oxleys Funeral Services | Cheshire |
| Oxleys Funeral Services Nantwich | Cheshire |
| Oxman Carpentry Limited | Buckingham |
| Oxon Construction & Renovation | Oxfordshire |
| Oxon Electrical Services Ltd | Bicester |
| Oxrend Ltd | Witney |
| Oxstalls Plumbing and Heating | Gloucester |
| Oxton Electrical Maintenance | Wirral |
| Oxus Construction | Kent |
| Oxus Ltd | London |
| Oxygen Property Partners | Merseyside |
| Oxygen Property Services Ltd | South Norwood |
| Oxyplumb Boiler Services | Oxfordshire |
| Oyster Chadborn | East Sussex |
| Oyster Electrical & Data Ltd | Bristol |
| Oyster Estates | Bognor regis |
| Oyster Removals | Chichester |
| OZ Electrical Ltd | Hayes |
| Oz Electrics Ltd | Biggleswade |
| Oz Joinery & Property Services | Bideford |
| Ozlocks Locksmith | Hertfordshire |
| Ozone Electrical Services | Kidderminster |
| Ozone Electrical Services | Kidderminster |
| Ozone Mechanical Ltd | Strood |
| Ozyer Plumbing + Electrical | Wakefield |
| Ozyer Plumbing And Electrical | Wakefield |
| Ozyol Cleaning | Intake |
| Ozzy Electrical Installations | Northampton |
| Ozzy Electrical Installations Ltd | Wootton |