Id’ing 1st Summer gulls (12 months old) is always difficult this time of year when their feathers are bleached and moulting. Have a look at this one
http://andyburnsphotography.zenfolio.com/p12189958/h21a5d145#h21a5d145
and again on the following two shots. Looks like it could be a YLG but no help from the feathers. The head was big and square, although not shown too well in the shots and the bill was big. The bird itself was big hence not a LBB. The Jizz was very different from the LBBs and HGs. Perhaps a hint of darker mantle feathers coming through suggesting not an HG.
Any support for a YLG?
Andy
Glamorgan Bird Club 
Looks pretty good to me, but would like to see moult limit – any open wing pics?
Barry, thanks for getting back. Unfortunately it was sitting down most of the time. There are a couple of other shots which I have uploaded to
http://andyburnsphotography.zenfolio.com/p12189958/h2706e94f#h2706e94f
One of them shows one wing! It was moulting as seen by the odd loose feather. I didnt get it in flight.
Lol, if you are around tomorrow, see if you can get some more shots of it?