www.gull-research.org

Headshape, small eye, patterning on the coverts, jizz.
Is there a chance nowadays to ID subspecies of YLG against LBBG?

Theo

Picture taken at Westkapelle, The Netherlands, 2009-09-24

Shade of grey in this bird probably too dark to fit any of the candidates in the michahellis group... Unfortunately!

Mars

No one dares to say more than Mars?

Theo

Looks like a monster 2cy LBBG to me.