Whilst the two chauffeurs up front in a Vulcan had ejection seats, the three in the back didn't and were supposed to calmly exit via the hatch, in the traditional manner. Even in the early days, when high flying was still the norm, this was not easy and, when low-level, ground-following flights became the norm, it was basically impossible. Even if you did get out in time, the ground would not be very far away.
There was an attempt at creating an ejection system for the back three.
The centre seat would be fired first, then the outer two would be pulled, in sequence, to the central position, and then fired out.
This test rig was built, but I doubt it got any further than that and was unlikely to have ever been fitted to an aircraft.