DB6
Sorry, my mistake, there were only three aircraft cancelled by Harold Wilson’s incoming government of late 1964
The P1154 supersonic vertical landing strike aircraft and the HS681 VSTOL tactical transport both got the chop on 2 Feb 65 and the TSR2 followed on 6 April 65.
The other one that I was thinking of in my earlier post was the Fairy Rotordyne but that actually was binned by the previous conservative government on 26 Feb 62.
As for your Bristol T188 that stopped flying about the end of 63 because it could not reach the speeds that the RAE boffins needed to do kinetic heating tests.
IMHO all four of the cancellations were correct on technical grounds (although the reasons quoted at the time were not technical)
All the aircraft had some really great features, but each had (in my view) a fatal flaw
P1154 (Exhaust temperatures and velocities too high thus requiring special sites/procedures for VSTOL take-off and landing. This precluded Harrier type operating site flexibility)
HS681 (Conceived to support P1154 in the field. In fact while I am sure it could have been made to fly it was on very dodgy ground so far as safety following engine failure and payload range was concerned)
TSR2 (Not enough wing. Too much of a straight line beast and as we have relearned there is no substitute for aerodynamics when you want to manoeuvre)
Rotordyne (On this proposed city centre compound helicopter the rotor was driven by tip jets - doomed by noise)
Humble apologies to all Flying Instructor types for hijacking your forum
JF