Range from the cheapest Fit a new plug socket £100 (Alan Bohee Electrical based in DN22) to the dearest Fit a new plug socket £145 (JS Electrical and Security based in Dn8).
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 DN21.