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Mallards come in all shapes and sizes. Have a look here; www.talking-naturally.co.uk/manky-mallards-domestic-feral-plain-odd-mall... There are several similar sites.
Mallard crosses cause arguments amongst the purists. While they do hybridise frequently with other duck species, wild birds also interbreed with various domesticated Mallard breeds that look quite different from their ancestors. So strictly these are "pure" Mallards, but they don't look the part. So the terms "Manky-" or "Heinz Mallards" (57 varieties!) have become popular.
I think the Muscovy is the only common domestic duck that wasn't originally a Mallard.
Lat/Lng: 50.2, -5.4
OS grid ref: SW6443