In 1984, a stage comedy titled Recall UNIT: The Great Tea-Bag Mystery was performed as part of the Edinburgh Fringe Festival. Due to other commitments, Nicholas Courtney was unable to appear as the Brigadier, even though the script had been written for him, but pre-recorded a telephone message from Lethbridge-Stewart which was written into the plot.
Nicholas Courtney: Pat Troughton was leaving and Jon Pertwee was coming in - exiled to Earth by the Time Lords for 'misbehaving in time' - and the BBC asked me to become a regular for a couple of years. Head of Unit. I was over the moon. A bit of security when my first daughter was born.
Nicholas Courtney: Looking back over the years I will always think of my time in Northampton [repertory company] as the most enjoyable and important of my career. I was given the chance to play some truly challenging parts and I believe it was during 1959 to 1961 that I really began to develop and expand as an actor.
Nicholas Courtney: (About director Douglas Camfield) He was determined to present the Army in an authentic light, he even managed to persuade the powers that be to let him engage a platoon of real squaddies for The Invasion. One day I overheard one of the men asking his real officer whether he should salute me or not, so I must have given a reasonable impression of the real thing.