Strange raptor seen in Parham Park, Storrington

Observation - Strange raptor seen in Parham Park, Storrington - UK and Ireland. Description: See new thread. Saw this raptor in parham park whilst out walking, pewrched in a mature oak tree. Sat there for about 30 mins before flying off. What is it? Looks like a funny buzzard to me, or is it an escapee from a bird-of-prey aviary. Any ideas?? Mo

See new thread. Saw this raptor in parham park whilst out walking, pewrched in a mature oak tree. Sat there for about 30 mins before flying off. What is it? Looks like a "funny" buzzard to me, or is it an escapee from a bird-of-prey aviary. Any ideas?? More shots posted up on Flikr Birdtrack.