X-Plane Essex And Herts Air Ambulance Livery AW139 1.0. This is an Essex and Hertfordshire Air Ambulance livery for the X-Rotors AW139. Their aim is to save lives, reduce or prevent disability, or suffering from critical illness and injury, by delivering a first class pre-hospital emergency medical service to the people of Essex, Hertfordshire and surrounding areas. Repainted in Gimp. By Paul Mort.