Range from the cheapest Downlights installation £270 (Complete Wiring Solutions based in DL1) to the dearest Downlights installation £321 (Synergy Renewable Energy Ltd based in DL1).
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 Arlington.