Miles M.9 Master I
In January 1939 large extensions to the Miles factory were completed and opened by the Secretary of State for Air. These were necessary to cope with a large contract for the Master I high-speed advanced training monoplane: a two-seater powered by a 536kW Rolls-Royce Kestrel 30 engine. Nine hundred were built.
Soon after the outbreak of World War II, the prototype Master II flew for the first time.
Miles turned out 3,249 of the 1940 Master I, II, and III advanced trainers.