I took these shots at Broughton last weekend,and only just getting around to looking at them on the screen,i’m still not sure as to it.
Possibly an odd looking,heavily worn herring gull,but it looked bigger than surrounding Herring gulls,larger bi-coloured bill,pale tail,pale brown tertials and primaries.Glauc\Herring cross??

after looking at more shots on the interweb , twas probably a big Herring gull 1st summer??probably no Glaucous influence looking at it again!