As well as appearing in various good films, Vanessa was a very good theatre actress. For a while she appeared with Timothy Dalton (James Bond) in a lot of plays, I saw them in Shakespeare's Anthony and Cleopatra and Eugene O'Neil's A Touch of the Poet.
I said she was a good theatre actress, because I have been disappointed in her last few appearances (The Trojan Women, The Year of Magical Thinking).
Corin Redgrave was equally good on stage, including various Shakespeare. His recent solo work, de profundis, was one of his best roles.