Confidence: I'm as sure as I can be.
Notes: A female. I have gone for the Common Blue Damselfly for the following reasons. 1) The black mark in S8 is roughly triangular which is unique to this species. In the Azure it is square. 2) The side of the thorax bears just one short black line, in the Azure there are two. 3) The shape of the medium lobe at the rear of the pronotum is gently curving, in the Azure in bears shallow indentations.