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I can see what you mean about Little Grebe, but the cheeks would not be so pale and the beak would not be so broad or so dark. If you look at a female R-c Pochard, it is a pretty good fit, isn't it?
My Flickr photos...
Lat/Lng: 52.95554, 1.01637
OS grid ref: TG027440
A waterfowl reseve at Blakeney, North Norfolk.