The T.8 Kirby Tutor was immediately popular but only seven complete aircraft were sold before the outbreak of
World War II, as well as kits of parts, spares and sets of wings (for retrofit to T.7 Kirby Kadets). The T.8 Tutor was also produced for use by the Air Training Corps, being renamed
Slingsby T.8 Cadet TX Mk.2. Sixty-two Cadet TX Mk.2s were ordered from 1944 with simple windscreens and landing wheels. Postwar Slingsby sub-contracted
Martin Hearn Ltd to build 25 new T.7 Kirby Kadets and 25 new T.8 Kirby Tutors and these were followed by about a dozen more built by Slingsby at Kirbymoorside. The interchangeability of the components led to many hybrid aircraft having wings and fuselages of all types mixed together. During the 1960s the numbers dwindled, especially when an urgent inspection of the main-spars was called for. The cost of the inspection and resultant rectification work often exceeded the value of the aircraft, with many being withdrawn from use. An example is on display at the
Gliding Heritage Centre. ==Operators==