Daughter of David Markham and Olive Dehn.
Daughter-in-law of Michael Redgrave and Rachel Kempson.
Elder sister of the actress Petra Markham.
Mother of two sons, Arden and Harvey Redgrave, with her husband, Corin Redgrave. Stepmother of Jemma Redgrave and Luke Redgrave.
She was nominated for a Laurence Olivier Theatre Award in 2000 (1999 season) for Best Supporting Actress for her performance in Noel Coward's "Song at Twilight" at the Gielgud Theatre in London, England.
Sister-in-law of Vanessa Redgrave and Lynn Redgrave.