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Like a tufted duck with a mohican :oD
Having looked at some images especially from the London Parks I think you are most probably correct. Just to complete your ID perhaps you should add a scientific name - Aythya fuligula x Netta rufina.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Thanks Chris - wasn't sure how to go about adding the scientific name for a hybrid but it's obvious really isn't it! Have revised the ID accordingly.
Lat/Lng: 50.281, -3.651
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