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I think it is the race puna, sometimes called Puna Teal, as a separate species.
My Flickr photos...
Ian, I would agree with Puna Teal (Anas puna), is it a sub-species of the Silver Teal or a species in its own right. References are conflicting.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Birdlife International have it as a full species...
Lat/Lng: 52.8269, 0.8986
OS grid ref: TF953294
In Pensthorpe Wildlife and Gardens - not wild, but I would appreciate an ID!