quick look at west rise. some gull passage including these 3

bird 1. caspo-esque. such a long attenuated rear on this one. the pic where it's rolling on its side especially showing a nice plain, pale grey saddle contrasting with the tertials, something you see on caspos. the underwing is pretty dark

bird 2. more straight forward. classic head/bill

bird 3. another sleek bird, long primary projection. the more advanced of the 3 in terms of moult - several 2nd gen wing coverts