Range from the cheapest Fit a new plug socket £80 (Atlas Electrical based in RM11) to the dearest Fit a new plug socket £200 (SRG-Sergio based in rm5).
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 RM1.