Went back to the tip in Essex with Steve on Saturday morning - best birds as follows.
Adult Caspian Gull - same individual as that seen last week and regularly at this site for several winters now.
Second-winter Caspian Gull - a nice, distinctive bird showing small white mirrors on p10.
(Presumed) Iceland Gull - the third-winter bird seen here for a few weeks running (and on several dates last winter). Opinion still seems divided on the ID but personally I can't get past it being an Iceland.
Here's a pic of it alongside Herring Gulls:
Adult Black-headed Gull with extensive blue dye staining - this was by far the worst-affected individual but several stained birds were seen on Saturday including a couple of pink Great Black-backed Gulls!