Latest photo taken on 18/2/2019
The photos below were taken on 10/2/2019
At least one other white-winged gull was also present. It looks like a 1st winter Iceland Gull but has a pale iris, a feature normally acquired in the 2nd winter/2nd summer period. It also has a relatively long bill and relatively short wing projection and looks to be about Herring Gull size. The possibility of a hybrid cannot be ruled out.
The shots below were also taken at the same location. The bird in these looks more like an Iceland Gull in structure.