Range from the cheapest Downlights installation £260 (KBR Electrical based in SG1) to the dearest Downlights installation £440 (L.A.L Gas Engineering and Property Maintance based in SG5).
Comparing electricians estimates for Downlights installation gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes for installing downlights by posting a job to electricians in North Hertfordshire.