Now got two weeks off from work, and started as I mean to go on by heading down the patch. I walked both sides of the Cuckmere today seeing the usual Jack Snipe on the eastern side, but noticed a very large gathering of Gulls on the west side. I quickly headed round there and soon found two Caspian Gulls (both 2nd winters) and an adult Yellow-legged Gull. One of the Caspos had a green ring on its right leg.
Unfortunately my photos have come out very poor for some reason, though the distance may have had something to do with it.
Although not captured, both birds had superb clean white underwings, not even showing any dark flecks around the coverts. Both very smart looking Gulls.