Pictures taken by a friend of mine on a recent trip to the island of Svalbard in the Arctic region of Norway
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This is Mandt's guillemot C.g. mandtii - extra large patch on the wing, and the race in Svalbard.
I'm in no position to disagree with you, but, since I have received 8 'agreements' I would prefer it if you put up an alternative ID
It is the same species - different race - so C, grylle is a correct ID. The flying image shows the obvious difference between our UK race and the Arctic race.
Lat/Lng: 77.9, 13.9