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I can see where you are coming from but, apart from the shape of the large white wing-bar, nothing else particularly fits. Tail feathers seem to have white edges rather than centres. The white around the alula has no corresponding mark on a Goldfinch. Some (but by no means all) of the markings would fit a Snow Bunting.
I think that a hybrid is likely.
My ID was very speculative, just trying to get things started. I did think - male snow bunting - but then there was something about the jizz that didn't seem quite right. You may well be right. Why not add it as a revised ID!
The wing-bar shape does seem very much to be that of a Goldfinch, in other words one which appears as a longitudinal bar down the length of the wing in flight. That's very different from the shape of the white patch on a Snow Bunting's wing. It's actually quite a rare shape for a passerine wing marking.
The head also looks very "chaffinch-y".
I still don't know what it is. Your suggestion of Goldfinch highlights the most obvious character.
I'm certainly leaning towards this bird at least having significant chaffinch blood. The head makes me think of a chaffinch more than anything else. However I still don't quite see the normal chaffinch wing pattern on either side. It may be posture rather than a real difference, but the two wings seem to have different patterns.
Lat/Lng: 51.9298, -4.5622
OS grid ref: SN239288