Unusually broad, white neck-ring and head marking
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The uncommon Anas vicarius, the Priest's Mallard; in olden days served as a roast at ecumenical gatherings, and source of the phrase "the parson's nose" ;-)
...signs of domestic Mallards in its ancestry.
No, I like your answer best!
Lat/Lng: 55.5984484, -2.4365414
OS grid ref: NT725339