is this a gosander?
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Dont disagree with the ducks in the foreground being Mallards. However the larger one in the middle is not like any of the other birds on the lake (smaller than the geese but bigger than ducks and moorhens)and is the one I cannot identify exactly.
One with some 'domestic' mallard in there as well. not massively far away from the one at the top of the article here - http://10000birds.com/manky-mallards-domestic-feral-or-just-plain-odd-ma...
Lat/Lng: 53.6421, -1.4512
OS grid ref: SE363163