B
brman
It was implied that the DNO had done such a test but I did re-ask the question and so far no explicit answers have been given. I was trying to rule it out but agree that we can't yet do so. However we do have numerical answers for insulation resistance that include some strange failures.
yes, it was your post I was picking up on really.
As to IR readings, again - I agree it must be significant that there are so many low results. Even the cooker I would class as low for the type of circuit!
I don't suppose the house is on a flood plain is it?