This dragonfly was in the shade on a chilly morning yesterday, hence he was lethargic and relatively easy to entice onto my hand. However, he was not completely torpid, as I found when trying to pose him for the camera. It was no good trying to get a head-on shot fully illuminated by the sun - because he persisted in turning himself so his body was at right angles to the sun (whence the contrast was too great from one side of his head to the other). I am familiar enough with butterflies warming-up by turning themselves so their flattened wings are at right angles (-ish) to the sun, but I had not noticed the behaviour in dragonflies before. He was happy enough to be turned head-down, again orienting his body at 90degrees to the sun, enabling me to get this picture.
If anyone happens to be able to identify the species, it would be useful to know.