Migrant Hawkers are one of the commonest Dragonflies that I see at St Aldhelms. They breed in water tanks at Trev's Quarry and I normally see them patrolling in that area. However, I found this male patrolling along the Barn Hedge. This is half way between Trev's Quarry and the nearest cottages by Weston Farm & it's possible that there could be a pond or two in those cottages.
They are smaller than the other autumnal Hawker species and the males have pale blue spots on a dark abdomen. They also have a yellow golf-tee shaped marking on segment two of the abdomen and short pale yellow ante-humeral stripes on the sides of the thorax.