Several males observed around the edges of the pond, seemingly untroubled by the Emperor and Brown Hawker dragonflies sharing the space.
No interactions present.
I think you are right about this. The similar Ruddy Darter has a constriction part way down the abdomen and yours looks parallel-sided. The Ruddy Darter also has black legs.
Lat/Lng: 52.02283770191, -0.70630609989166
OS grid ref: SP888368
Managed field of grasses and other flowers, surrounded by hedgerows. Contains natural and artifical ponds at the south end.