Gulls

Pic A:- Front row, Black-headed Gulls (larus ridibundus), immediately behind is a Yellow-legged Gull (Larus [cachinnans] michahellis). The others I am not sure, I thought there were some Black-backed Gulls (Great and Lesser) and maybe a Common Gull in the same flock.
Pic B:- I think Black-backed Gulls of both varieties, Great have grey legs and darker wings, Lesser have dull yellow legs. At least one has been ringed.
I will post more pictures and perhaps letter or number them to ID.