Sorry about the poor quality of the photo but it was taken through a window. I wondered if this is what is called a leucistic greenfinch.
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I wouldn't say it's leucistic, I think judging by other photos that this is just a younger bird which hasn't got all of its adult plumage yet, a juvenile to be more technical. Hope this helps, Scott.
Thank you for the comment, Scott.
Lat/Lng: 57.6, -3.7
OS grid ref: NJ0459