The P.1154 family grew from designs begun in 1960 around the Bristol Siddeley BS100, a vectored-thrust turbofan intended to provide roughly 33,000 pounds of thrust. The Royal Navy compared the proposal with the Phantom, while the RAF wanted rough-strip capability without undermining programs such as Jaguar. Common engines and avionics might have worked, but distinct naval and land-based airframes were more realistic than forcing both services into one configuration. The naval proposal also used short takeoff and barrier-assisted recovery, which could have produced a STOBAR aircraft before the ski jump.
Chapter · 4:25-7:32
P.1154, the BS100 engine, and a failed joint requirement
The Hawker P.1154 paired a powerful plenum-chamber-burning engine with incompatible naval and RAF demands before cancellation in 1965.