Range from the cheapest Downlights installation £290 (Radoslaw Konieczny based in NW4) to the dearest Downlights installation £490 (B.S.D Design & Build LTD based in NW4).
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 NW4.