Caspian Gull?

1st winter Caspian Gull?, Milton, 9th February 2007, © Dick Newell
This bird reminds me of this bird, that I struggled with, but, when opinions were asked, was passed as a Caspian Gull. The overall impression strongly supports Caspian Gull, as do the head and bill-shape and pale spindly legs. The bill is perhaps a little short and the scapulars are unusually dark, so it is possible that this bird contains other genes. (RGN)