Hi Jenny, welcome to the forum. I've just logged in so am going to take a bit of time to read your posts properly. It's good you posted though, there are some good people here for advice. As Debi said, the first thing to do is look for normal explanations first then paranormal. I was just wondering, you live in a maisonette, do you have shared attic space? By the way I am also in the UK. Welcome to the forum again.