Range from the cheapest Downlights installation £260 (RMC Electrical based in S13) to the dearest Downlights installation £440 (D S Steele Heating Enginneers based in S73).
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 S61.