I've spent a long time looking through many books and also online, and I think I've nailed this particular gull down to be a juvenile first winter Herring Gull. I am more than willing to be shot down though. I never feel confident with these birds, but I am growing to appreciate them a lot more and dare I say it, enjoy watching them. It's great to scan a large group and pick one out that's slightly different and then try to decide what the devil it is.
Anyway, this bird was seen at New Brighton on the Wirral a few months back. Please advise if you believe this to be something completely different. I can handle the truth.
Juvenile first winter Herring Gull