But you agree that most of the time "get a qualified electrician in" would be the best advice?
It's certainly true that such is the 'safest' advice, particularly when one does not really know much about the knowledge, skills and capabilities of the person involved. However, that's a general truth, and really amounts to simply saying that DIY electrical work should never be undertaken.
However, the fact remains that DIY electrical work
does happen and that only a tiny proportion of those who come to a forum like this to ask questions are likely to actually comply with advice to "get a qualified electrician in". Whether we like it or not, a high proportion of them are going to attempt to do the work, anyway, whether or not they get any constructive advice. ... and, as I said, I personally would not sleep well if I knew that someone had come to harm when I had chosen not to give advice which may possibly have prevented that harm. Your conscience obviously works differently from mine, which is fair enough.
Kind Regards, John