The bird has been identified as a Peregrine Falcon. As I said before I have seen them all soaring happily together in the past but this time it must have been in a stroppy mood. It was on Saturday afternoon that I was at the bottom of the garden trying out a pair of old binocs that I have been cleaning. I looked up to see a buzzard soaring high up. I checked it with the binocs to make sure it wasn't a gull when the Peregrine appeared into shot. I watched it flying directly overhead almost falling over stuff in the garden when it folded it's wings in and dropped like a stone towards an estate behind me. I didn't see it fly up again. The Peregrine has been busy in the past few days, flying early in the morning afternoon and evening.