On 24 February 1950, the Armstrong Siddeley Cheetah-powered prototype serial number "WE522" performed its maiden flight. Months later, an extensive evaluation was performed of the Provost prototypes, which was flown head-to-head with the rival H.P.R. 2 at RAF Boscombe Down; it also underwent tropical trials overseas. Reportedly, feedback from trials was largely favourable, especially of its handling characteristics, with only minor refinements being recommended. Ultimately, the Leonides-powered P.56 was selected for production as the "Provost T.1"; on 29 May 1951, an initial order for 200 aircraft was placed. During 1961, production of the type was terminated, by which point a total of 461 aircraft had reportedly been completed. The Percival Provost eventually formed the basis for a jet-powered derivative, the Jet Provost, which ultimately succeeded the piston-engined Provost as the principal