John Levene makes the extraordinary claim in the documentary that the UNIT team was actually he, Jon and Katie - and that Nick C. was not really part of the team as his sense of humour was different from theirs and that he spent most of the time down the pub, which irritated Jon Pertwee.
Regardless of that, I think that Nick had an extraordinary chemistry with the others, and made him hugely important in the success of UNIT.
He also says that he knew the UNIT era's time was up when Tom Baker turned up and it was clear that Tom had an ego and didn't want to be part of a team. Which does sound like Tom admittedly.
He also says he would make an appearance in present day Who like a shot.
It would have been - and still would be - nice to see Brigadier Benton make an appearance.
However, both RTD and the Great Lord Moff seemed to have both forgotten his phone number.
Which also sounds very much like them, admittedly.