Range from the cheapest Downlights installation £290 (G.Tagg based in IP31) to the dearest Downlights installation £490 (Morgan Engineering based in IP1).
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 IP14.