Cecil's first television appearance was in playing a leading role opposite Vanessa Redgrave in "Maggie", an episode of the BBC television series First Night transmitted in February 1964, which he later called "a baptism by fire because I was being seen by half the nation". After that he spent eighteen months in repertory at Salisbury, of which he later commented, "You learnt how to make an entrance and make an exit." His parts at Salisbury included the Dauphin in Saint Joan, Disraeli in Portrait of a Queen, Trinculo in The Tempest, and "all the Shakespeare". His first West End part came in May 1965 in Julian Mitchell's dramatisation of A Heritage and Its History at the Phoenix, in which he got good notices, and his next was in a Beaumont production of Peter Ustinov's Half-Way up the Tree, directed by Sir John Gielgud. In film and television, Cecil almost always played upper class English characters. His screen work included the roles of Cummings in The Diary of a Nobody, Captain Cadbury in the Dad's Army episode Things that Go Bump in the Night, Bertie Wooster in Thank You, P.G. Wodehouse, Ricotin in Federico Fellini's And the Ship Sails On, and Captain Hastings in Thirteen at Dinner, Dead Man's Folly and Murder in Three Acts. He has been called "one of the finest upper-class-twits of his era". In 2009 he appeared in an episode of Midsomer Murders. He also worked in radio, where his credits included The Hitchhiker's Guide to the Galaxy and The Brightonomicon. He also appeared in The Next Programme Follows Almost Immediately, playing characters with very bad foreign accents. Additionally, he stood in for Derek Nimmo in the role of the Bishop's Chaplain, the Reverend Mervyn Noote, in the second series of the radio episodes of the ecclesiastical sitcom All Gas and Gaiters, which ran for twenty episodes. In the series of adaptations from P. G. Wodehouse What Ho! Jeeves he played the recurring character Bingo Little. He narrated audio books of many of P. G. Wodehouse's books, performing voice characterisations for each character, and becoming possibly the most known narrator to ever perform the series. Cecil wrote occasionally for The Spectator and The Times Literary Supplement. In one piece he noted He also admitted that "... most of my experience has been in comedy, that’s the way life has taken me ... if I have any regrets, it’s that I didn’t do parts with more depth".
Personal life
Cecil was married twice. He met actress Vivien Heilbron when they were both studying at the London Academy of Music and Dramatic Art, and the couple married in 1963. They were divorced after he met the actress Anna Sharkey while appearing at London's Mermaid Theatre in 1972; he and Sharkey married in 1976. Cecil died from pneumonia on 22 September 2011 at Charing Cross Hospital in London, aged 72. He had suffered from emphysema.