there was plans for a supersonic Harrier version but the plenum burning reheat hadn’t been fully solved iirc before they dropped the version
Yes, the P.1150. However, Hawker thought that it was too small to meet the NATO spec requirements, so developed it further into the P.1154 proposal. RN and RAF bickering delayed that until it was eventually binned by the Wilson government along with the HS681 (good riddance) and tragically the TSR-2.