Archimedes,
A long departed dear friend who was deeply involved at the time always claimed that there had been an Air Staff decision to call TSR2 the Claymore S1 in RAF service.
Conspiracy theories abound but at the end of the day it was way over budget, the RAF could barely afford 50 of the things, no-one else was going to buy it, the economy and the currency were in a right old mess, and at the time of the cancelation it didn't actually work!
It would have worked, they would have sorted the engine, vibration and undercarriage issues, and it could have gone into service.
But would that have been a good thing? If we had 50 Claymores we would have had no Phantom FGR2's, MRCA would probably not have happened and the UK industry would have taken the same hit anyway, just a year or two later.
It was a classic low under the radar nuclear strike aircraft that would have been entering service just as NATO was abandoning the nuclear tripwire and going over to measured response and a period of conventional warfare. Would it have been as good at that as Tornado? I don't know but I doubt it.