Ah well there ya go, if he was a big bugger then it was definitely a Peregrin Falcon.
The fastest animal in the world, in a dive it can reach a speed of 160mph and I have been very fortunate to see this at close quarters, It took my breath away as it dove and swooped about 6 feet from the ground. AWSOME.
I forgot to ask Boss, do you know the difference between a wild goose and a tame goose?