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The all blue and slender abdomen (with the exception of S1 (not really visible in this shot)) rules out the male Broad Bodied Chaser and the Black Tailed Skimmer.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Lat/Lng: 51.1642, -0.7085
OS grid ref: SU904413