Who We Are 1999 DSAA was registered as a charity in December 1999 by a joint venture of trustees from Dorset and Somerset Ambulance Service. Seed funding was received from the Government and the Automobile Association. The airbase was established at Henstridge, near Sherborne. The charity operated from a broom cupboard in Taunton Ambulance Station with one fundraiser and one volunteer, eventually moving to a portacabin on this site. Manage Cookie Preferences