Cardiff Bay gull roost is always a challenge – distant birds and low light. This bird instantly stood out amongst the flock tonight. I am pretty confident on its ID but comments always welcome
Cardiff Bay Roost
Cardiff Bay gull roost is always a challenge – distant birds and low light. This bird instantly stood out amongst the flock tonight. I am pretty confident on its ID but comments always welcome
Glamorgan Bird Club 
you haven’t said which gull species you think it is.
I’m no Gull afficianado Gareth but are you possibly mooting Caspian?……
2CY Caspian gull