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Agree with Yellowhammer, but not a juvenile. A juvenile would not have that depth of yellow on the head. Also, the wing feathers look a little worn on the edges, where a juvenile would have fresh feathers (the adults have had theirs for a year now, so they are quite worn and bleached).
My Flickr photos...
Lat/Lng: 52.6129, 0.7966
OS grid ref: TF894053
found in mixed hedgerow adjacent meadow.