As a bit of Trident fan I think it is great that one is being preserved. The T3 made great noise on take off when the boost engine was used. I was thinking about that looking at the flite deck pic and wondered where the controls for the Boost engine are- there appear to my untrained eye only three thrust levers.
Did the boost engine have a 'throttle' I assumed it did or was it a case of on or off??
PB