Range from the cheapest Boiler service £80 (M C Technicians Ltd based in SE9) to the dearest Boiler service £150 (Mcgilway Hall based in SE18).
Comparing heating engineers estimates for a Boiler service 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 a boiler service by posting your job to heating engineers in SE18