Quote:he is fairly confident with electrics but this one has stumped him
That is because confident is not the same as competent. I might be confident to fit a boiler, but it doesn't make me competent, I certainly couldn't test flow rates, gas pressures, and god knows what else.
I don't have a problem with people undertaking work themselves, but it should be within the law, and be under instruction or advice by someone in the know. And there is no excuse now since you have online forums such as this where you can come and get advice before carrying out such tasks.