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Mistles are larger, more upright birds, with less colour to them. They have a paler face, with a larger bill; greyer wing feathers with pale edges; and they lack the buff background to the spots on the flanks. The spots on this bird, when magnified, can be clearly seen to be arrowhead-shaped, not round as in Mistle.
My Flickr photos...
Thanks! I looked so hard at the photos and yet missed so much!
Lat/Lng: 52.0625602, 1.1569885
OS grid ref: TM165451