Range from the cheapest fixing an electrical fault £60 (LONDON CITY ELECTRICIANS NICEIC Approved based in W1B) to the dearest fixing of an electrical fault £150 (Drain Plumb Ltd based in WC2H).
Comparing electricians estimates for troubleshooting and diagnosing an electric fault 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 to fix an electrical fault in SW1Y by posting a job with HaMuch and we will send it to electricians in SW1Y.

"Troubleshoot & diagnose an electrical fault. Replace a burnt socket and replace main fuse"
SW3