Black beak and eye, white breast, black bar on wings
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Thanks! I didn't think they looked like gulls at the time and immature kittiwakes seemed the only vague match to the markings - should have noticed the lack of any adults and stuck to my instincts. Didn't think to check winter plumage - it was only 1st October!
Lat/Lng: 60.074, -1.209
OS grid ref: HU441324