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The male has a "U" shaped mark in abdominal segment 2 and a black concave mark in S9. The female has a square shaped mark in S8, all suggesting the Azure Damselfly.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
If these were Common Blue Damselflies, the male should have all blue S8 and S9 and a mushroom mark in S2. The female would have a triangular or "house shaped" black mark in S8.
Lat/Lng: 51.7073, -4.8693
OS grid ref: SN018048