3w Caspian Gull Standlake

My usual quality: despite the upperwing and underwing patterns being spot on for Caspian this bird often looked a bit square-naped and, given its relatively short bill (even allowing for 'false impressions as pale tip lost against water), had me wondering if it had any Herring genes. But Mr Lewington thinks not so that'll do me! Supect its a female on head jizz (?).