The prototypes were ordered by the Ministry of Supply to Specification E.15/48.
It was produced for the Air Ministry to specification E.27/49 and differed from the P.111 in having a swept fin and rudder with horizontal tail surfaces high on the fin to improve longitudinal and directional stability.
It was designed to Air Ministry specification F.1/40 for an airborne observation post.
In Britain, Dr. James Allan Jamieson Bennett, Chief Engineer of the Cierva Autogiro Company, in 1936 conceived an intermediate type of rotorcraft, which he named "gyrodyne" and which was tendered to the British Government in response to an Air Ministry specification.
Air Ministry Specification No. 11/42 was issued retrospectively to describe the outline requirements.
The Yeovil was designed to meet Air Ministry Specification 26/23 for a single-engined day bomber, with a Rolls Royce Condor engine specified by the ministry.
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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.
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In 1930, the British Air Ministry issued Specification M.1/30 for a carrier-based torpedo bomber to replace the Ripon, to be powered by the Rolls-Royce Buzzard or Armstrong Siddeley Leopard engines.
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.
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 final Parnall aircraft was an open two-seater trainer derivative of the Heck to Air Ministry Specification T.1/37 named the Parnall 382, later the Heck III.
After the failure of the Pipit, Parnall never got a production order for a military aircraft and never submitted a front-line prototype again, though they did compete for the trainer specification Air Ministry specification T.1/37 with the Parnall Heck III.
Air Ministry specification F.20/27 was issued during the design process and Saunders decided to submit the A.10 even though that specification only called for two guns and suggested the use of the radial Bristol Mercury rather than the inline Rolls-Royce F.XIS that designer Harry Knowler had chosen.
Sherpa was designed by David Keith-Lucas as a research aircraft aimed primarily at assisting in the development of wings for faster, very high-altitude aircraft in general and the company's Preliminary Design (Short PD.1) in response to the U.K. V-Bomber requirement B35/46 in particular.
The Vickers Vellore, named after the Indian city of Vellore in the state of Tamil Nadu, was a response to Air Ministry specification 34/24, which called for a civil mail and freight carrier.