Range from the cheapest Downlights installation £260 (Barry Chadwick Electrical Contractor based in ST17) to the dearest Downlights installation £390 (Smart Switch Electric based in TF2).
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 ST20.