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I think it probably is a female Teal, showing the small white streak alongside the tail, in the second picture.
My Flickr photos...
What size was it? Might it be a female Pintail?
Looks nothing like a teal - looks like a large red head, with a red eye - or very pochard like :-)
I think the light is confusing you and making things look redder than they really are. This is not a Pochard...the head shape is wrong and the overall jizz is wrong. I admire your confidence that it is not a Teal, but I think it probably is! ;)
...all of you - I think it's impossible to be anywhere near certain one way or t'other ;-).
The head shape in picture 3 looks a bit pochard-like though... Hmmm...
Blocky-looking, plain head, white edges to tail, rather dainty bill. Light's very yellow, making things more rufous, and looks like either a low-res image in the first place, very zoomed or high ISO reducing the detail. If you squint at it a little it brings out better contrast, and looks very Teal-like.
Flickr pics: http://www.flickr.com/photos/72243477@N00/
The one thing beyond contention is the white patch visible in pic 2 either side of the tail (which Ian referred to in the first comment). To me this suggests teal and certainly rules out Pochard.
The head shape in one and three look a bit different. Maybe it's an illusion. I don't know.
Lat/Lng: 51.6131, -2.6126
OS grid ref: ST576906