This female southern hawker (Aeshna cyanea) was laying her eggs in rotten logs at the edge of the pond. It flew across to check me out and hovered disconcertingly at eye level a foot in front of my face.
This female was green and black; the males are blue and black
We have seen these dragonflies before, hunting in the woodland clearings. They are noticeable not just for their bright colour but also by their size: they are about 3 inches long with chunky bodies that look like small helicopters.