It's worth a trip to Linton Pond at the moment if your interested in Gulls with at least six possibly seven species of Gull available. Today along with two immature Glaucous Gulls, 20+ Lesser Black Backed Gull, Herring Gull, Great Black Backed Gull, Common Gull & Black Headed Gull I also had a fleeting look at a possible adult Yellow Legged Gull. The flock was spooked a couple of times though and there was a lot of movement in and out so unfortunately I wasn't sure. Will certainly be going back though.
Added note, after a bit of digging tonight my YLG was more likely to have been a dark argentatus Herring Gull, oh well, maybe next time.