Common or possibly Migrant Hawker
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Although superficially similar, the short antehumeral stripe, the pattern on the side of the thorax and abdominal spot pattern all suggest the Migrant Hawker.
Forgot to add the costa (leading edge of the wing) is dark in this specimen, in the Common Hawker it is yellow.
And a great picture.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Lat/Lng: 51.871721768624, -1.0297966003418
OS grid ref: SP668196
Nature reserve on farmland, liable to flooding, so numerous pools that attract waders