<p>I managed to get a few shots of this dragonfly in flight, but it moved very quickly and the light under the shade of the trees around the pool was not good. I don't know what species it is but the yellow and blue markings are quite striking.
It may be a Aeshna cyanea - Southern Hawker or Aeshna juncea - Common Hawker?
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<ul><li><i><a href="//commons.wikimedia.org/wiki/Aeshna_cyanea" title="Aeshna cyanea">Aeshna cyanea</a></i></li></ul>
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/37804979@N00">Tony Hisgett</a> from Birmingham, UK
CC BY 2.0
<p><a rel="nofollow" class="external text" href="https://www.flickr.com/photos/hisgett/1350589491/">Dragonfly in flight 2</a>
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<ul><li>Uploaded by <a href="//commons.wikimedia.org/wiki/User:Magnus_Manske" title="User:Magnus Manske">Magnus Manske</a></li></ul>