Hundreds of Black-headed Gulls, lots of Lesser Black-Backed Gulls, low tens of Herring Gulls including a couple that generously dangled their legs in flight showing them to be Yellow-Legged Gulls. about 10 Common Gulls and one juvenile Mediterranean Gull.
Local birder Alan has some fantastic shots of juvenile Med Gull from Rye Meads on his blog. This may have been the same bird. My photos are inevitably nowhere near as good, but I like to think give a flavour of the reality of scanning through a distant flock. It is in focus - honest. It's just the heat haze giving it that blurred look.