So, I'm not quite sure what to make of this gull. It's got yellow legs, a dark blue-grey mantle, not a lot of white in the wing tips, and a dark hood. I guess its an extreme michahellis? Or is it another atlantis type?
It was certainly striking when I picked it out of the melee on Stewartby tip this afternoon. On an open wing shot I have it has a band on P5, and appears to have quite a bit of black still in the coverts making it a third-winter type. My current best guess is a michahellis with an above average dark hood. Any other suggestions?
EDIT - some more images of this bird can be found on my Flickr here. These were taken Sunday morning in slightly better light.