Duck

Hello Phil, I think it looks like a breed of Muscovy duck (possibly Lavender Muscovy Duck) which as far as I am aware were a domestic species which were originally imported. Other members may be able to confirm this or offer other suggestions. If you have any regular mixed bird seed you could put some own for it and a shallow dish of water; hopefully it will move on if it comes from the local area/breeder/poultry keeper.

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Regards, Hazel 

"Each kindness shown to birds or men is sure to flutter back again"