Range from the cheapest Downlights installation £270 (Ian Cowpland based in TN31) to the dearest Downlights installation £440 (Voltage Electrical Services (UK) Ltd based in ME14).
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 TN17.