I’m assuming that this is the female Common Darter, but the females in particular of the various resident and migrant species of Darter are incredibly difficult to tell apart sometimes, even for the Dragonfly specialists! Interestingly I spotted a magnificent and seemingly tireless Brown Hawker plus a Hairy Hawker and a Gold-Ringed Dragonfly all within ten minutes of taking this photograph! Unfortunately however, I couldn’t get anywhere near any of them to get pictures.