Range from the cheapest Downlights installation £290 (Malcolm D Macneish Electrical Ltd based in SO50) to the dearest Downlights installation £490 (I Gas Engineers Ltd. based in PO15).
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 SO32.