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This is a mallard, probably partly Indian Runner from its very upright stance. The reason your photo is not displaying might be because you did not click on UPLOAD after you attached it.
I couldn't say what it is crossed with, esp in a park area.
Paul Seligman. Flickr: http://www.flickr.com/photos/paul_seligman_cardiff/collections/721576087...
Lat/Lng: 51.569096, -0.103185
OS grid ref: TQ315872