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A really nice set of images whether I'm right or wrong on the ID.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Thank you for your help,never sure if it's the hybrid!
The slightly blunt but toothed sepals do suggest the hybrid H. desetangsii.
Lat/Lng: 52.1, -3.4
OS grid ref: SO0451