These are two different animals but I think they are the same.
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Male left, female right. Please see the link below.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Thanks Chris - I can see the difference now that I've looked at them side-by-side. Thanks for the link too - very useful! :-)
Lat/Lng: 51.7, 0.4
OS grid ref: TL6606