Range from the cheapest Downlights installation £290 (Complete Power Solutions based in CM17) to the dearest Downlights installation £490 (Gemini Properties T/A Simon Donovan based in CM5).
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 CM5.