Range from the cheapest Downlights installation £290 (MI Electrical Services Ltd based in GU34) to the dearest Downlights installation £450 (Skylight Electrical Services Ltd based in RG22).
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 SO24.