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Did think of this species, should have looked myself really!!!! Just hadnt seen one with such distinctive markings before. But, Google images show ones like this, so thanks for your help.
The abdominal markings do seem quite variable.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Lat/Lng: 52.449, 0.521
OS grid ref: TL714864