Well, I assumed a tufted duck x greater scaup (cf. the picture on page 59 in Collins), but thought it looked similar to the lesser scaup I saw in the US last September, not to mention the recent photos from France on surfbirds. I wasn't able to photograph the wing pattern at first and only managed yesterday because someone finally decided to drive a motor boat straight through the little flock of tufted ducks it hangs around with. I have nothing else to add to the specific ID features that have already been discussed.
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