Hawker P.1154 RN Osprey / Sea Harrier
The P.1154 was Hawker's original proposal for an in-service VSTOL aircraft developed from the P.1127. With the powerful BS.100 engine it would have been supersonic, whilst a full size AI radar and BVR missiles would have given it a weapons capability similar to the Phantom. Predictably, it was not to be; trying to build a ground attack aircraft for the RAF and a Fleet fighter for the RN using the same airframe was always an unrealistic target. In addition, the Plenum Chamber Burning ( a sort of vectored afterburner) which was needed for supersonic flight never really worked and in any event, it produced extreme exhaust temperatures that would have buckled any ship's deck.
The Indian navy operated 10 BAe Osprey FA.21 from the INS Vikrant & Virat,
equipped with Matra Magic AA missiles and Sea Eagle ASMs in lieu of Red Top .