Gull ID help please (1 Viewer)

[beardo]

Hello - first post for me so apologies if anything is amiss.
Could anyone help me with this bird seen today at Kilnsea wetlands. Caspian gull or Great black backed gull?
Thank you,
MB

 

[leifvester]

First instinct was GBBG, but I must admit I've never seen a Caspian gull

 

[lou salomon]

With such a contrasting plumage, yes to GBBG.