Range from the cheapest Downlights installation £320 (J&M HOME IMPROVEMRNTS LTD based in TW4) to the dearest Downlights installation £364 (CSV Electrical based in TW5).
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 North West London.