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Pic taken from approx 2km away from bird at 24x optical mag. Day was overcast - cloudy.
as well as can be told, buzzard or crow.
... as much as I can to enhance the image I'm going to stick the boat out for a corvid. There is colour and texture to be seen in the branch below the bird so I believe if there were any colour or texture to be seen in the bird it would show up therefore it must genuinely be an all black bird hence corvidae. I wouldn't bet my house on it though.
Lat/Lng: 51.0, -1.3
OS grid ref: SU4930