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A juvenile Yellowhammer, born this year, would not have a yellow head at all. That only comes with age, and so this is a fully grown male. The ends of the tail feathers can be seen to be very raggedy and worn, suggesting the bird has had those feathers right through last winter...again pointing to a fully grown bird.
My Flickr photos...
Thank you Ian for your very helpful comments.
Lat/Lng: 51.7, -0.4
OS grid ref: TL1609