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The leg stripes are not so prominent in this image but they are there, making this a Common Darter. This is also confirmed by the pale antehumeral stripe on top of the thorax.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Lat/Lng: 52.1474, -0.048
OS grid ref: TL336516