A friend is converting a house into 2 flats. All electrical work has been done by a qualified electrician on weekends. He has now found out the electrician's boss won't sign off the work because he hasn't done the job and would be potentially liable for tax if he did sign it off. The guy who did the job can sign off existing wiring jobs but not new builds apparently. What are the options? Can he pay someone to come in and test the installation and sign it off and if so how much is it likely to cost?