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The majority of domestic ducks are bred from Mallards (but Muscovy Ducks have also been domesticated).
This one is obviously of Mallard descent, so can correctly be called a Mallard. Aylesbury Duck is only one of several breeds that are, or can be, white - but the specific characters of Aylesburys include a pink (not orange) bill. This may be something like a white Campbell, or it could be a non specific feral Mallard that doesn't really fit the characteristics of a defined breed (like mongrel dogs).
Lat/Lng: 51.4013, -0.0221
OS grid ref: TQ376687