Also a possible Ring-billed Gull (Bill heavier and Paler mantle than Common Gull?) and Argentatus Herring Gull (Darker grey mantle than Argenteus and large amounts of white on primaries?). I apologise for my awful photographs and almost constant queries about Gulls, but it's something I want to improve at and something I put quite a bit of time into.
Good luck to Edward in his study of Herring Gull taxonomy; it's a fascinating topic. Unfortunately I can't see enough on the photos to form an opinion.
There are times when I wouldn't mind returning to the days when Herring Gulls were just Herring Gulls.