This gull stood out. Clearly darker upperparts than nearby argenteus and with extensive pale tongues, white tongue tips but with no black on p5. Maybe a summer plumaged argentatus or even a hybrid CaspianxHerring?
This adult 'Med Gull' didn't seem quite right either
and one of the two leucistic Herring Gulls which are currently around. This bird has a contrasting grey mantle with light brown ghost markings in the primaries.