Re: USA probably at the root of it
I hope it will one day be reveaied but there is definitely a pattern in the cancellation of various projects such as blue streak, TSR2 and other things that didn't see the light of day. It is still surprising that Concorde, Harrier etc saw the light of day given the pathetic short sighted old politicians. Black Arrow would be OK because compared to its contemporary Saturn V it was a cornflakes toy.
University of Leicester has a Skylark rocket in the foyer of its physics building along with other spacey bits on display.