I was working in Sully today so I called in 3 times. Unfortunately there was no sign of the Caspian Gull only an adult Y l Gull.
Moving then to the Knap and finally the docks where a good candidate for Caspian or Y l Gull was present opposite Morrisons mid afternoon. It roosted for about an hour until I left, it never came close enough and only had bins.
Well done to the guys who found it, perseverance paid off.
Surprised at the lack of interest in this Welsh mega with just a handful of birders!