Frazer , be very careful what you sign for . There is an ongoing legal case here in the Midlands , following a fatality .
I'd have to refresh my memory on the details but so called testing was being done by , basically, an electrician's mate I believe, filling in certs by copying the last one , and a supervising QM was signing them off .
I think they were both sentenced to prison terms but I'm sure its ongoing at the moment .
I followed the case at the time and I don't believe any normal testing would have found this existing fault but you there was other stuff ....I think RCD trip times were recorded but there was no RCD . Something on those lines .
The fault , by the way , was a plasterboard screw into a metal stud wall vertical, digging into the live of a cable , ( from when flats were built) Stud wall on floorboards, not connected to earth, completly encased in plasterboard ...but actually live . A leak on the plumbing made everything live and a fatality occured .
BUT........I would say ...not the direct fault of the two people in court ...although their testing procedure left much to be desired .