Range from the cheapest Downlights installation £290 (Professional People based in CB9) to the dearest Downlights installation £370 (Argent Electrical Services Ltd based in CB21).
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 CB21.