Range from the cheapest Downlights installation £175 (Energy North Ltd based in N11) to the dearest Downlights installation £490 (MS M25 Electric based in N21).
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 N14.