Driving home I saw this scuffle by the side of the road and slowed down to look. Sparrowhawk wasn't bothered by the car at all so I dashed home to get the camera. I was back within a couple of minutes and fortunately the bird was still there and the car was a perfect hide. Luckily at first there were no pedestrians around to frighten it off, so I got a good ten minutes snapping away. A bit gruesome, but the pigeon seemed to be being eaten alive!