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Blue horn with yellow patch underneath (don't know it's correct name, I'm sure it has one). It turns purplish grey when getting ready to pupate.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Lat/Lng: 51.514, -0.093
OS grid ref: TQ324811
on pavement in proximity to a variety of trees but not directly under any