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It was designed to Air Ministry specification F.1/40 for an airborne observation post.
The result was Air Ministry specification 26/27, which also encouraged the use of a metal airframe for use overseas and of the abundant Napier Lion engine.
Air Ministry Specification No. 11/42 was issued retrospectively to describe the outline requirements.
The M.39B Libellula (from Libellulidae, a taxonomic family of dragonflies) was a Second World War tandem wing experimental aircraft built by Miles Aircraft; a scale version of the M.39 design proposed by Miles to meet Air Ministry specification B.11/41 for a fast bomber.
The Parnall 382 was a newly designed two-seat open cockpit trainer, with some Heck components to meet Air Ministry Specification T.1/37.
The Westland Yeovil was a British biplane bomber designed and built by Westland Aircraft in 1923 to meet an Air Ministry Specification for a single-engined day bomber.