Range from the cheapest Downlights installation £250 (Gisbourne Electrical based in GL2) to the dearest Downlights installation £490 (Spectrum FMS Ltd based in GL4).
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 GL18.