Would anybody out there care to make comment on this gull that was present on the fresh marsh yesterday afternoon. When I initially saw the bird the combination of the bright yellow legs and dark grey mantle looked good for yellow-legged gull but the heavy head streaking doesn't seem to fit with what I know about them (but that isn't much). That has made me move towards a lesser black backed gull but which race? Looking in the books (Gulls) I would go for an adult winter graelsii as a much darker bird joined it later (no photos) which I would assume to be intermedius.
After all that, I may be wrong so feel free to make and suggestions