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Firstly great pictures, from looking at the marks on the sterna I would say it's either T. extensa or T.pinicola. Looking further into it now.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Thank you for your comments. I have found a short paper on splitting the two. Looks like it needs very close examination and hence I'll be unable to get any further with this one.
Lat/Lng: 50.6, -3.5
OS grid ref: SX9588