Adult Russian Common Gull (heinei) on the Thames by the O2 arena today. Key features dark mantle, v limited head streaking and primary pattern (lots of things to look at here but most importantly broken p4 band and black on outer web of p8 reaching primary covs).
Also around the O2 today a 1w Kittiwake a 1w Med Gull a flock of 30+ Lapwing and an ad Casp x HG hybrid.
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