Range from the cheapest Downlights installation £290 (W K D Electrical Specialists Ltd based in N13) to the dearest Downlights installation £440 (Romex Building Service based in N22).
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 N22.