The P.150, a development of the Buccaneer, was proposed in 1968. It was to have had a thin wing, modified radar, a fully revised digital inertial nav/attack system and would have been powered by Spey engines with reheat. Whether it would have been as successful as the Tornado is hard to say.
Although TSR.2 would have had considerably more range than Tornado and would have been far superior at high level, it wouldn't have had the excellent all round versatility of Tornado. But it looked much nicer!