If I had to go low level, I'd choose a
BEagle - not still harping on about TSR2!!
Absolutely the right decision when it was cancelled, even though the decision was taken for completely the wrong (political) reasons.
A typical English Electric bit of kit - aerodynamically brilliant, but the engineering was appalling. Had it ever made RAF service, it would have been the greatest Hangar Queen of all time. Up to the time of cancellation, the flight-test programme had been one long tale of failure and delay.