No interactions present.
It might just be a Mallard, of course! Reminded me of a presumed Pintail/Pochard I had seen somewhere, a long time ago, though...
My Flickr photos...
This one definitely is a hybrid, and as such is a very interesting observation.
Ophrys suggestion seems like a good one (perhaps with Pintail x Red-crested Pochard as an alternative possibility?).
You might want to consider posting your photo on this flickr site:http://www.flickr.com/groups/hybridbirds/
Several people who are very interested in hybrids, and have made a point of studying them, regularly visit the group.
Thanks for the comments - I have posted it on the flickr site and will see if any further comments arise
Lat/Lng: 52.1574, -2.6898
OS grid ref: SO529512
FRom the hide at Bodenham Lake