This dragonfly is similar to the Migrant Hawker, but has vivid blue and green markings rather than blue and brown. The Emperor also has similar colours, it has a green body and blue tail, whereas this Southern Hawker is a mixture of blue and green all over. Southern Hawkers are around from July to September, and are mainly seen in flight (although they do occasionally land on vegetation such as a small branch, and dangle down vertically.

The female is similar to the male, but more of an overall green pattern. The one below is probably a male, despite appearing more green.

You can see in the photo below, that despite its bright colours the Southern hawker seems to vanish when it rests in a tree...