Range from the cheapest Downlights installation £250 (HMS Property based in ST7) to the dearest Downlights installation £340 (Deltek Fire & Security based in CHESTERT).
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 ST1.