It's a 'mucky mallard' - a hybrid domestic bird.
thanks for the reply.
It might be this one reported in Bird Guides which is stated as a Mallard/Eider hybrid. It's been hanging around the north east for a couple of years
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Tony
My Flickr Photostream
Well spotted and remembered TJ, good to see you back!
2013 photos & vids here
eff37 on Flickr
That is a very good possibility as it was in a group of Eiders at the time