I think these may be Artic terns but not sure?
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Andy, I agree, I too think they are Arctic Terns, Add the identification yourself and get the credit.
Please see my Flickr photo's www.flickr.com/photos/129804972@N07/
I agree these are arctic terns - they have short fully red beaks (no black tip as you would see on a common tern) and appear to have short legs.
Lat/Lng: 57.222082933351, -5.6745457649231
OS grid ref: NG782205