The Hawker Demon fighter was modified from the Hawker Hart light bomber, the hart had been found, to the RAF's horror, to be so fast that it was almost impossible for it's existing Bulldog and Siskin fighters to catch it. As a "quick fix" temporary solution, the Hawker Hart airframe was fitted with a more powerful supercharged Kestrel engine and an extra Vickers machine gun and re-named the Hawker Demon fighter. The Hawker Demon fighter was introduced in to RAF service in 1931 and 305 were eventually built, approximately 200 were supplied to the RAF and remained in service as a fighter until 1938 by the Bristol Blenheim, a few were then utilised as target tugs for a few years. Some of the Hawker Demon fighters produced by Boulton Paul were fitted with a Frazer-Nash hydraulically powered shield for the rear gunner and were referred to as "Turret Demons" It is of note that while the RAF was the Hawker Demon's primary user a significant number were supplied and operated by the Royal Australian Air Force. | 
