hi please can a sparky help me an elderly friend of mine was rang up by a company asking if they could give him a free wiring saftey check as they were in the area. they pointed out his earth was bad and earthed boiler water pipe gas pipe and changed consumer . his wiring is in cavity but he said they said that was safe .it cost over £800 plus they told him £175 was for certificate from council all sounds odd whats your opinions on it was he conned? consumers are very cheap are they not?