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I'm not completely convinced that Black-throated Diver can be ruled out from this photo (though it may well be a Great Northern).
I think the head shape is sufficient to point to Great Northern - Black-troated Divers have a much rounder head, without the pronounced forehead
It's not uncommon to see a Black-throated Diver with a pronounced angular forehead.
Lat/Lng: 57.5844, -7.5126
OS grid ref: NF706683