More then that, in the original script, as Number 2 is leaving the Green Dome Number 6 meets with the new Number 2 framed in the doorway. Number 6 walks passed giving The Village salute. That would have been a nice little scene to have been retained for the completed episode. There had been a breakdown in control, Number 2 needs to be replaced, and there he is, moments later after that telephone call from Number 1, the new Number 2 ready to take up his administrative details. Number 1 of course, knew how it was going to be with this Number 2, and had organised his successor, a new Number 2, long before Number 2’s mental breakdown!
Be seeing you