Not sure if this is a blue tailed damselfly or a common blue, difficult to tell from angle.
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Perhaps the biggest clues to the ID are the bi-coloured pterostigma (Small patches near the end of the wings) and the all blue abdominal segment 8.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Thanks for that Chris, the bi-coloured pterostigma are almost impossible to see on the FSC guides!
Have a look at the link above, it might help you for the future.
Lat/Lng: 54.5655, -1.2133
OS grid ref: NZ509192