This Caspian Gull was one of two at Dogsthorpe Tip on Saturday morning. I'm not too sure about the age of this bird - it's either an advanced 3rd-winter or a slightly retarded 4th-winter. The primaries look better for the former age but everything else perhaps fits with the latter; note the retained immature tertials on the bird's left hand side in the third photo. The right wing was pretty much adult like.
A first-winter Herring Gull also found a football on the pit, proceeding to play with it on the ice. Didn't fancy its skills much, though.