With gulls you always keep on learning, so I am hoping that Peter or Jan can help me with this one.
I saw this LBBG yesterday at Blythburgh pigfields, but was not able to take any images in the heat haze, but did get some today. I thought it was a 2cy, but though the pic is not great, it shows the fact that it has completed primary moult - which is why I picked it out. The primaries looked new almost and were apparently not in moult; to me they all looked like second generation feathers.
Am I going mad, and it is in fact a 3cy?
PS - also 2cy Caspian and Yellow-legged Gull today