I saw this today whilst walking around a local lake and believe its a male Emperor Dragonfly, and I was surprised to see it at this time of year
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A male Migrant Hawker. The all blue abdominal spots and the yellow triangle on abdominal segment 2 are clues.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Lat/Lng: 52.7, -1.4
OS grid ref: SK4215