Range from the cheapest Downlights installation £270 (Powernet electricals based in TA1) to the dearest Downlights installation £370 (PWB Electrics Ltd based in DT6).
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 TA16.