Range from the cheapest fixing an electrical fault £88 (Hemiko based in SE1) to the dearest fixing of an electrical fault £98 (Solec Electrical Ltd based in EC2A).
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 EC3N by posting a job with HaMuch and we will send it to electricians in EC3N.

"Troubleshoot & diagnose electrical fault"
E1