Found the previous week, but it took more cold weather to bring it within photographic range!
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Looking at this recent posting and the ensuing debate, could this be a Black-necked Grebe. They look very similar.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
My instinct too
I can understand your thoughts, the two species are similar in winter, however in the field this was certainly a Slavonian Grebe (I have seen both in winter plumage at this site previously). I think this is a 1st-winter, hence the white at the back of the head and duskier neck. It was present for over a week, with many people getting much better pictures than mine!
The bird had a stout, level bill (as opposed to the finer and slightly upturned beak of Black-necked). The bill was pale at the base and with a pale tip, and in most poses had a flatter crown than BNG.
Lat/Lng: 52.62082, 1.32719
OS grid ref: TG253077