Gull ID please - UK, Hertfordshire, Great Amwell, Feb 23 (1 Viewer)

[xaviertaylor]

Dear all - Apologies for the bad photos - shot at dusk at a distance!
This gull stood out to me - but can't put my finger on what it might be. One open wing shot seems to show a small mirror on P10... other than that, plumage seemed a bit darker than the accompanying Herring gulls, but obviously lighter than the LBB gull also in the photos.
Head doesn't seem right for Caspian, so I wondered if YL Gull? In the bad light it was hard to see if the legs were actually yellow.
Is it possible to get a good ID with these shots?

 

[lou salomon]

looks good for YLG, 3rd cycle (4cy). Caspian excluded by the amount of black/little amount of white in wingtip. dark iris is not common but possible in 3rd cycle michahellis.

 

[xaviertaylor]

Thanks for the explanation... glad that for once I was thinking along the right lines!!!!