I watched "The Importance of Being Oscar" a one man play written and performed by Micheál MacLiammóir.
Can't remember what prompted me.
Well worth a watch. Although the audio is a bit low.

https://m.youtube.com/watch?v=6zbjYzf4K7o

Made in 2 x 50 min single takes on a fixed lens. Considering how cumbersome TV cameras were, and operated, moved and focused by a single person, I'm impressed by the camerawork.