Perhaps I should switch places with the OP. At the beginning of the month I heard some unusal birdcalls, so got out my binoculars and started taking a closer interest in the birdlife at the back of the house. I was ever so pleased with myself for eventually spotting and identifying four sparrowhawks, who have taken to hanging around, mainly just perching and watching. The very considerable downside of this is that I don't think I've seen or heard a single head of the local small community of songbirds in the past week. I just hope that most of them managed to get asylum elsewhere. I'd swap them for the sparrowhawks any day.