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These are the 'black' variety of fallow deer. They are melanistic but not a simple recessive gene as most albino or melanistic animals are; they occur too frequently and can form whole herds.
My first thought was sika deer from the shape (long neck and angular muzzle profile) but the sharp contrast between the upper and lower body pelt and the all black tail (though some of the island sub-species of sika can also have all black tails) show these to be fallow.
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Lat/Lng: 51.7972, -0.598
OS grid ref: SP967118