I couldn't get a photo but I can describe it. It looked like a buzzard at first but when it flew off its wings had a white streak on either wing, a little like a wood pigeon.
No identification made yet.
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The underside of a Red Kite's wings have big white patches on. See http://www.gigrin.co.uk/index.html for film of one in flight.
Certificate in Contemporary Science (Open)
Lat/Lng: 52.4, -1.5
OS grid ref: SP341781