That Odd Gull

Comment from Steve Sutcliffe on Lyndon's posting below:-
A bit strange - to my knowledge there are no dye’s which are likely to show that sort of all over hue. I wonder if it got into some sort of chemical or agricultural spray area which has contaminated it across all its feather tracts and of course would not show on the blacker areas. If you blow the picture up a bit the wing mirrors also look bluish and the legs and beak look a bit duller than the other bird too. Nice one Lyndon.