Differant shades of Guillemot.
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They are Tystie, in winter plumage, thanks for reminding me of the other name, that name seems to be used more here.
I believe the name originates in the Shetlands and reflects the norse history of that part of the world. I think the Norwegian name for Black Guillemot is Teist whilst the German is Gryllteiste.
Its like the local name, Whaup, which is a Curlew, we have a local area called, Whauphill, which could be about the number of them, which were seen there.
Lat/Lng: 54.9103, -5.0253
OS grid ref: NX061614
At the end of the Railway Terminal.