Having been completely unaware of any Caspian Gulls in the Cuckmere earlier today, I picked up Bob initially to do a roost at Charleston Reedbed, but seeing hundreds of Gull settled just north of Exceat Bridge, we decided to look at these.
I started scanning, and 10 Gulls in I instantly found an adult CASPIAN GULL walking through the group. It stopped and unfortunately went to sleep, but every now and then raised it's head and did a few wing stretches, enabling all wing detail to be seen.
With falling light, we concentrated on just this bird, but a brief scan didn't produce any more potential candidates. There were however a couple of argentatus Herring Gulls.
Having been really pleased of finding a Caspo on the patch, and in Sussex for the first time, I was slightly gutted to find out a maximum of 3 had been seen earlier in the day, but I'l have it as a self-find for now! However looking at DC's pics, my bird does seem to have more black on the bill, so it could well be a different bird, heres hoping!!
Other features seen not in the images below were long primary projection with predominant white on P10 with a black sub-terminal band creating a clear mirror.