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Probably a female Common Blue Damselfly but there are some other options; however I cannot see enough detail of the markings near the tail to give a definitive ID.
Do you have any other images that you could upload to this post.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Sorry sadly this is the most in detail image
Lat/Lng: 51.1668, -0.7054
OS grid ref: SU906416