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Difficult to see detail, when it is blown up. The rear bird looks more like a Black-tailed, from the apparently pale underparts with some distinct barring, and its legs look long, but I would not offer that as an ID.
My Flickr photos...
I'd go with Barwit for the left-hand group (they look capped and the backs look a bit streak-patterned to me at maximum resolution, but agree that the RH bird looks as though it could be Black-tailed. Longer tibias than the others, which makes me think Blackwit too.
Flickr pics: http://www.flickr.com/photos/72243477@N00/
Lat/Lng: 50.8323, -0.9383
OS grid ref: SU748041