This "Common" Gull from earlier this month at carsington res in derbyshire, the main oddity being its red bill. Certainly an interesting individual. Only photos i have found cover black headed x common, and a piece of information about a photo of a possible med x common seen by bill oddie on hampstead heath, this article had a photo of a med x common taken from dutch birding, apparently both of these articles were mid 90's. So if anyone can point me in the right direction of finding anything on med x common, that would be great.
This bird maybe hybrid, may have a stained bill or its just abberant, as an extra the bird was paler than surrounding common gulls.