First-winter Caspian Gull
Adult Med Gull
Not sure. Maybe a Yellow-legged Gull but looks too pale and anaemic- perhaps a splash of another taxon in there?
Juvenile Herring Gull- argentatus? Large with retarded moult-most probably of high latitude origin
Similar to immediately above but moulting some mantle feathers and scaps- argentatus? Probably.
2nd/3rd winter Herring Gull- argentatus