[2] Development of the Gemini was conducted at a rapid pace following the end of the Second World War, the company being keen to bring its new designs to the postwar civil aviation sector.

While efforts to revive production were made, including the development of the improved Miles M.75 Aries, the type was never able to regain momentum.

[3] On 26 October 1945, the prototype Gemini performed its maiden flight; it was initially flown with a temporary fixed undercarriage, unlike future aircraft that featured a retractable arrangement instead.

However, even as the company was finalising work on numerous improvements, including the adoption of new engines, the firm was forced to declare bankruptcy due to the poor state of its finances.

Various aspects of the Gemini were shared with the Messenger; while a similar tail unit was one such shared feature, the Gemini had only twin vertical tail units instead of the more complex triple arrangement of the Messenger as the higher wing loading and elevated landing speed raised of the latter made the twin arrangement practical.

One of the few adverse handling characteristics was a marked tendency for the aircraft to swing on takeoff, which was easily addressed by the pilot using full rudder and differential throttle settings to counteract.

Furthermore, two-thirds of all Geminis that had been initially sold to British customers would be subsequently resold aboard, the type being fairly desirable upon the secondary sales market.

[5] During the late 1940s and early 1950s, individual Geminis were frequently entered in air races; in one example, G-AKDC, flown by J.N.

'Nat' Somers AFC, emerged as the victor of the 1949 King's Cup Air Race (a handicapped event) at 164.25 mph; this aircraft was fitted with de Havilland Gipsy Major engines that were rated at 145 hp each.

[6] Several aircraft were used as light business transports by commercial firms, including Shell-Mex & BP, Fairey Aviation and B.K.S Engineering.

[5] During 1951, a pair of aircraft were completed by F. G. Miles that were fitted with 155 hp (116 kW) Blackburn Cirrus Major III engines, along with enlarged and heightened fins for better handling during single-engine operations.