Subsequent to the MAD incident, a procedure was introduced where the boost could be started in flight. It involved a very lengthy procedure with CB's being pulled to make it think it was on the ground and an extremely small relight speed window (IIRC). The Chinese insisted on this from the start on their T3's.
With Gil Gray, I took one of the T3's to Hatfield for sorting out the wing cracks. While we were waiting for the transport back to LHR John Cunningham showed us round one of the Chinese examples. All the decals were in Chinese and the flight deck extended back to the fwd door, where the fwd toilet usually was, to make space for a huge desk portside rear, where the 'Commondant' of the aircraft sat - inter alia making sure the crew didn't defect to the West.