UK hosts: mortgage issues

I posted recently about insurance issues in the UK and think that I have finally got that sorted. However, have any hosts here contacted their mortgage company to see if they’re allowed to host under their mortgage agreement? I have read online that it is something that needs to be checked as if you are found in violation they could ask for whole mortgage to be paid back! Is this true and what are peoples experiences? I feel so close to setting all this up and becoming a host but there always seems to be a stumbling block in the way.

I’ve heard of this during a re fi! If they find out you are doing commercial business it could null your mortgage, and they could accelerate it! (Call the whole thing due.) this is in the US though, not sure about other places. But why would renting your place long term be ok but doing Air isn’t?

What a nightmare!