On Saturday I attended Martin Garner's of Birding Frontier's fame Gull master-class at Stubber's Green,Walsall, West Midlands. As usual with Martin's classes there are very informative and a great experience when watching the very misunderstood larger gulls complex. Although I didn't see any white-wingers at Stubber's Green, I did improve my knowledge on the tricky 1st winter Yellow-legged Gulls and 2nd winter Caspian Gulls , when Martin picked them out in the sizeable gull flock. What was also interested to note was the number of "Northern" Herring Gulls at this site. I now believe that the majority of the Herring Gulls which occur in the Midlands during the winter are of the " Northern" race (Argentatus). So in conclusion if you have the chance to go on one of Martin's classes and have the same addiction for gulls as myself, I couldn't recommend it more highly! Which one is the unusual gull?... Ok it's a 1st wint...