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It's an adult in winter plumage but I cannot tell you if it's a male or a female, perhaps someone else can.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
It is impossible to say whether male or female for a Little Grebe in a photo. I agree it is almost certainly an adult, though young ones are moulting into a similar plumage as the winter goes on.
My Flickr photos...
Lat/Lng: 51.394, -1.2776
OS grid ref: SU503663
On the Kennet & Avon Canal at this point