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A male. The narrow antehumeral stripes, the yellow costa (leading edge of the wings) and the spotted abdomen right down to S10 suggest the Common hawker.
Nice shot by the way.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Lat/Lng: 50.699, -3.92
OS grid ref: SX645905