It's on the homeowner. Wheather it has happened or not, or would or wouldn't doesn't mean we should ignore it. Plenty of people here are happy to ram part p down peoples throats, so either stick to it, or not.
I agree that whether or not there ever have been,or ever will be, prosecutions is irrelevant. However, and with respect, it's just plain daft to suggest that a criminal prosecution can be taken against a house, and equally daft that a criminal prosecution could be taken against a homeowner in relation to something done (or not done) by a previous houseowner. If the previous houseowner had committed murder, would it be reasonable for you to be prosecuted for it?
...and you obviously cannot have read much of what I write if you think that I am one of the people who would ever "ram Part P down people's throats"!
Kind Regards, John