Excellent Dave. We have a nesting pair not a million miles from here. When at sea close too the high cliffs we could watch them leave the cliff, sour to a great height and you knew something spectacular was going to happen. I've seen the tuck into a ball and dive onto an incoming racing pigeon, hit it and drop it then immediately fall again to pick it up while falling, still at a great height. It was as if the first hit where the feather would cloud the sky was to knock the pigeon out, before carrying it back too the chicks. Some said you can read the pigeon post too see when there was a pigeon race from the continent, you'd then guarantee this sight. All I know the Peregrines seemed to know and nested on the route the pigeons took back from Brittany.