There has been something in the loft since we moved here. We now sleep in the main room beneath the loft and you can hear it making noises. It is too big for a rat as it thumps and there is only one of it. It is most active early mornings and late evenings. Most of the time it sounds like it is playing football up there and dust occasionally falls between the brown varnished wooden boards that form the ceiling. My best guess is that it is a stone marten seen below. I have tried to see it by climbing into the loft with a torch but it freezes and I haven't been able to see it yet.