I only moved here a few weeks ago. I was in the bathroom which is downstairs and heard a massive bang like something exploded or something really heavy fell. part of the bathroom is in original house and part is in a ground level extension so no rooms above it. Next to it is a small room with hot water tank, washing machine, heating pipes. None of which were on. Other side is the kitchen. Nothing switched on there either. I’ve gone round the whole house and can’t see anything out of place or evidence of any “explosion”. Starting to worry there has been some sort of hidden pipe burst somewhere. Is that even possible?