Three black-headed gulls still in breeding plumage. I think that the other gull is a Common gull.
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I certainly never thought the scientific name would change! Just shows you should update field guides regularly - or else use the "get recommended" button. I am learning constantly!
I think there's a common gull - 2nd from front - but it's not too clear.
James P Deans
Lat/Lng: 56.2779, -2.5864
OS grid ref: NO637096