Imelda Staunton began her stage career playing the likes of St Joan and Piaf in repertory theatre. More recently she has starred as Dolores Umbridge in Harry Potter and the Order of the Phoenix, busy-body Miss Pole in Cranford, and the eponymous back street abortionist in Mike Leigh's Vera Drake. She talks to Mark Lawson about her life and career, from her early ambitions to become an actress to her recent role on the West End stage in Entertaining Mr Sloane, as well as various experiences along the way: working on a Steven Seagal film; auditioning for Cats at Andrew Lloyd Webber's house and her Oscars experience when she was nominated for Best Actress for Vera Drake.