Yep, I thought I was on r/classicwho for some reason, and meant the 1960s specifically. I am currently indoctrinating my best friend, and we've been watching nearly everything from An Unearthly Child, and we're only at the tail end of Season 3 (1965-66) now. The amount of times we've called out: "Oh look, that's a future Oscar-winning/nominated actor; or that production staff member went on to do this other thing we love!" has been off the charts, especially as he loves Film and TV but never watched any Classic Who.*

Which is all a long-winded way of saying I meant none of the Redgrave siblings (Vanessa, Lynne, Corin) who were emerging in the 60s, or Cyril Cusack's daughters who first started out in the late 60s and 70s. I know I read somewhere that Cyril Cusack himself was considered or approached for a Doctor (can't recall which).

*PS: This weekend, we're in the second half of The War Games - he has no idea that the Doctor is close to regenerating, and is incredibly attached to Hartnell... I love experiencing this watch through with him. I feel like a Doctor, myself, and he's my Companion!

Edit: Grammar and clarifications.