The Miles M.15[1] was built in response to Air Ministry specification T.1/37 which called for a two-seat basic trainer.

At first sight, the M.15 looked rather like the earlier Miles Magister, a low cantilever wing monoplane with tandem open cockpits and a fixed, spatted main undercarriage plus tailwheel, powered by a single inverted de Havilland Gipsy series in-line engine.

The vertical stabiliser had straight leading and trailing edges, giving it a triangular look compared with the rather pointed Magister surface.

The wingspan of the M.15 was slightly less than that of the Magister, but the planform was more curved along the trailing edge and the total wing area greater.

It has been suggested[1] that the constraints of specification T.1/37 made it impossible to achieve the performance goals; true or not, no manufacturer received a production order for an aircraft designed to it.