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It is half way through its post-juvenile moult. The new red feathers on the breast are gradually replacing the brown, pale tipped juvenile feathers. It still has the head and mantle to go, so a few weeks before it is fully fresh.
My Flickr photos...
On the day I was unsure, but the picture suggested a robin, but not quite right. A juvenile in transition to adulthood would be logical - thanks
Lat/Lng: 52.55, -3.94
OS grid ref: SN685964