So at last, something that captured my interest in the Tophill Low NR gull assortment. Apologies for the poor quality pictures. The bad light, then heavy rain and the great distance means these are pretty poor and hence are well cropped to show an image! But if you click on them, maybe the bird on the right gives up its identity to you.
Have any thoughts? Feel free to leave a comment. Unfortunately the bird flew off during the heavy rain and I didn't get any more pictures.