Customer had extension wired by 'less than reputable electrician' Inspected by LABC electrician who merely states "Zs too high on sockets". There were no values stated on his report, perhaps he had a Megger and used no-trip setting and got even higher value. The highest one was 0.68Ω. Whilst this may be higher than expected, though approximately half the maximum allowed, is it reasonable to just state "too high" and offer the customer no advice other than get someone to 'repair' I discovered why it was that high but could not 'repair'. It was an extension to the circuit of the half the bungalow. The original ring (now two thirds of the circuit) is wired in 2.5mm² with 1.0mm² cpc. and long. Any views?