Range from the cheapest Downlights installation £250 (B.E.S Best Electrical Services based in SO41) to the dearest Downlights installation £440 (Enriched Electrical based in BH7).
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 SO41.