chalk grassland / wood edge
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Very interesting. My instant reaction was the same as Tim's, including wanting to see the sepals! But I'd not come across V. odorata var. carnea before. Having looked it up I can see exactly why that ID is suggested, but all the photographs I can find show that plant with rather reddish flowers - hence the name I suppose. I see this is in a fen, which of course suggests that V. palustris is indeed possible. I don't think, in reality, it's possible to be certain which one we're looking at from these photographs.
BSBI VC Recorder
The habitat is given as chalk grassland/wood edge which does not seem likely for palustris. More photos needed!
as Cicuta points out palustris not likely in this habitat, so I'll go with a form of odorata
Lat/Lng: 51.616, -1.3336
OS grid ref: SU462910