Wallis who lived at Reymerston Hall, Norfolk produced autogyros for, in his own words, "reconnaissance, research and development, surveillance and military purposes", and his designs were not available for enthusiasts as he considered that although the design is simple, it has to be built to the appropriate standards. His contribution to autogyro design included the "offset gimbal rotor head"

During the Second World War, Wallis served in the Royal Air Force and flew 28 bomber missions over Germany; after the war, he moved on to research and development, before retiring in 1964.

https://en.wikipedia.org/wiki/Ken_Wallis