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Can you rule out the Dark Marbled Carpet in this colour form ? If not here is the ID - Common/Dark Marbled Carpet (Chloroclysta truncata/citrata)
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
It was difficult to get a picture of the underside but definitely showed a wavy line rather than the more hooked line of the Dark Marbled Carpet
It is possible to agree with the ID because of that. Worth including descriptions of such features in the notes above rather than comments, people can then agree with the ID provided.
Lat/Lng: 51.4236, -0.771
OS grid ref: SU855701