I just hope people don't get all snarky if Nicholas Courtney and Barry Letts aren't included.
I wouldn't have expected Barry to be included, as great and kind as the man was he had The Waters Of Mars dedicated to him in 2009.
As I only started with the show in 1988, it had ended before I really could savour it. So the first new Who to get excited was the Pertwee Radio stories in 1993 and 1996. Jon, Nick and Lis back together, scripted by Barry.
That Lis isn't around just seems wrong. Still I suppose it would have been worse for the gents had they outlived her.
....how do you think Tom feels? Well, actually, we know. Tom usually rambles a bit in his newsletters but with the posting about her death, he's clearly struggling (I think anyway) to put down all of what he's feeling.