Range from the cheapest Fit a new plug socket £90 (E7 Electrical Ltd based in E6) to the dearest Fit a new plug socket £250 (Boiler Repairs London based in E9).
Comparing electricians estimates for a Fit a new plug socket 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 by posting your job to fit a plug socket to electricians in E15.