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Here is a link to an ID guide for the White Legged Damselfly which highlights the differences.
Here is a link to the Common Blue Damselfly ID guide.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Thanks for the correction!
Alan Brampton (Benson)
Lat/Lng: 51.6308, -1.1115
OS grid ref: SU615928
Dry grassland by a hawthorn hedge - 100m from nearest water.