Range from the cheapest Downlights installation £234 (KPH Electrical Services based in L20) to the dearest Downlights installation £390 (Ideal electrical solutions based in L1).
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 CH43.