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The light stripes on the legs are diagnostic for the Common Darter. The Ruddy Darter has all black legs.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Its a female by the way, the widely spread anal appendages are the clue.
Lat/Lng: 52.0086, -0.3973
OS grid ref: TL101356