The first flight, at Heston Aerodrome, was made by Boulton Paul's chief test pilot Flight Lieutenant Cecil Feather.
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These were bungee sprung, though there were plans for oleo dampers.
The P.111 was designed as the smallest airframe which could couple an engine (Rolls-Royce Nene), an ejection seat (Martin Baker), and a delta wing.
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.