THE LIVES OF artists, or artistes, can be full of drama. But the life of Cilla Black does not seem to have been among the most eventful. Cilla (15 September) is a three-part biography of the enduring entertainer, starting with her life as a typist in early-1960s Liverpool. In this first episode, she was persuaded onstage at the famous Cavern Club, met the boy who would share her life, and failed an audition with Beatles’ manager Brian Epstein, the man who would make her a star. And that was it for drama. The singer was a fixture on ITV for many years, and ITV has commissioned a warm-hearted and uncontroversial biography. Everyone was likeable. Thirty-three-year-old Sheridan Smith effortlessly shed at least 10 years to play the flighty young singer. Aneurin Barnard found the sympathe