It was later scaled down to 45% of its original size to produce the de Havilland Gyron Junior, which was more successful.

Flight testing started in 1955 on a modified Short Sperrin, a bomber prototype designed as a fallback in case the advanced V-bombers programmes failed, that was instead reused as a research aircraft.

[2] Addition of a reheat section boosted output to 20,000 lbf (89,000 N) and then 25,000 lbf (110,000 N) in the DGy.2 The Gyron was selected for a number of projects, most notably the Hawker P.1121 (sometimes referred to as the Hurricane) supersonic attack aircraft that was to have been the replacement for the Hawker Hunter.

Another design potentially based on the Gyron was the Operational Requirement F.155 interceptor, which optionally used the Rolls-Royce RB.106.

Government financial support of the Gyron project itself was cancelled in March 1957, at a reported total cost of £3.4 million.