This duck was keeping company with a male mallard and the bill and tail are similar. Could it be an albino mallard - it is not shown in my bird ID book
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You won't be the last person to be tripped up by a mongrel mallard - you're certainly not the first. If you paste the following link you should be able to see quite a few examples.
The bird is a male - it has the curly tail feathers. In addition to domestic genes/bloodlines, it may have a recent shot of real mallard in there somewhere, but shows no obvious sign.
The linked article about mongrel mallards has itself probably included another easy mistake to make.
The 3 birds photographed at Radipole in 2009 have no primaries - that and beak colour says that they are males in eclipse, though extremely late as it is dated October. I would bet a small sum that they are good, pure mallards once they moult through - which would also explain why they are identical.
I have mailed the photographer to point this out.
Both birds in your photos look like domestic Mallards (the one with more typical plumage has the larger 'rear end' that is seen in some of the domestic forms).
The three drakes at Radipole on the 1000birds web page are correctly captioned as domestic Mallards. They may still be coming out of eclipse plumage (short primaries are visible on at least the left two birds), but wild type Mallard drakes in eclipse plumage look like these (1st, 4th & 5th photos on this page); http://www.birdguides.com/iris/pictures.asp?mode=search&sp=27083&rty=0&r...
Lat/Lng: 50.6, -0.2
OS grid ref: TV2987