Roger,
Boeing are currently flying a developement program with the TU114 ( Concordski)
There was an interesting program on TV in USA the whole Concordski program.
It was apparently the last one built and had been in mothballs since the Paris crash.
The program also claimed that the Paris crash was due to a French Mirage shadowing the Concordski trying to get inflight photos of the then new canards on the 114.
There was a most enlightening interview with the French head of the Accident investigation who stormed out of the meeting - " moi!"