Believe it or not, this is a wild goshawk! I'd never seen one before. The other morning I came downstairs to this one sitting at the table and chairs just outside the kitchen. My mum said it had been flying into the window. I ran to get my camera, came back and sure enough it launched itself at the glass between us. It was quite scary - like something out of a Hitchcock film. After it had flown off, I went outside to try to work out why it had been behaving in this way. I noticed that the trees and sky were reflected in the window so clearly that it was hard to see inside the house at all. We think the goshawk must have seen its own reflection and thought there was another one infringing on its territory. At least by that explanation we can assume it wasn't after us!
Technical details: Canon 7D MKII + 100-400mm lens at 400mm; 1/500 sec at f/5.6; ISO 500.