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They look more like domestic geese to me...
These are domestic geese (bred from Greylag Geese).
The shape of the beak is one feature to look at - geese tend to have a much 'heavier' base to the bill (as well as other structural differences, like a longer neck).
White domestic Mallard (duck); http://thethunderchild.com/Hobbies/April06/WhiteDuck.JPG
White domestic Greylag (goose); http://www.domestic-waterfowl.co.uk/images/embdens/trio.jpg
Lat/Lng: 52.598877106431, -1.1508178710938
OS grid ref: SK576004