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I think it should be Sedum acre
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
I think you are right.
... but I'm not sure that it's Sedum acre (biting stonecrop) either. I think that it might be Sedum rupestre (reflexed stonecrop).
Lat/Lng: 51.2527, -1.079
OS grid ref: SU643507