Whether with PCB/BS100 or with deflected thrust reheated Twin Spey, P.1154 faced insurmountable headwinds, such as in Chief Defence Scientific Advisor Solly Zuckerman: P.383, Monkeys, Men and Missiles, Collins,1988: "a technological and economic impossibility". He, thus his boss SecState Defence Healey, wondered which sortie required supersonic+V/STOL. Remains a good question re.F-35B.
Does anyone here really wish to assert that RN would have been better served with single-engined P.1154, or RAFG with no F-4s (don't harp on about fat, slow Speys)?