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Seen at Smardale Gill, Cumbria on 6.6.2014
I think that one is a Large Red Damselfly, Pyrrhosoma nymphula.
From the colour I would guess its a young ('teneral') male - the black bands on the tail should go darker, and the yellow stripes on the body will turn red.
Thank you Charles. I am sure you are correct. My book only shows images of adult damselflies.