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Hi Lou, Thank you for your aswer. I had come to the same conclusion, mostly by default, since other possibilities (mostly American or even Thayer's) don't fit that much :? Any other experiences of such retarded juveniles in late march or later ? A north/east origin ... Why not to explain (very) late...

Hello gull experts This is my first post, concerning an unusual gull seen in Boulogne-sur-mer/France in late march a few years ago. It was in almost full juvenile plumage (only a few scapulars were moulted), and was a bit smaller than local Herring Gulls. Pictures are given without any "enhancements...