Which type of gull did I see?

QI was going through some old pictures and found this one from about 10 years ago which I initially thought was a Ring-billed Gull as there was no red on the beak. This was in my garden in Dundee. Art Sangster

AIt’s hard to make out detail on the bill, unfortunately – there does appear to be a dark band there, but there could be some red, or it could be dirt. In favour of it being a Ring-billed Gull is that it seems to have yellowish legs; however, this is also hard to make out for sure, and in general size and structure it looks more like a Herring Gull. A Ring-billed Gull is closer to a Common Gull in size and structure.