One of Nunn's stipulations for agreeing to direct "Practical Cats" was that actress Judi Dench would be cast in the musical. Lloyd Webber was happy to oblige given her credentials and so Dench joined the company in the dual roles of Grizabella and Jennyanydots. Former Royal Ballet principal dancer Wayne Sleep was offered the part of Mr. Mistoffelees after Lloyd Webber and Mackintosh attended a performance by his dance troupe, one of the many dance showcases they saw in preparation for the musical. Casting for the other roles began in November 1980, with auditions held across the UK for dancers who could also sing and act. There was an initial disagreement over the casting of Nicholas as Rum Tum Tugger; Nunn had misgivings about the actor's easy-going attitude but eventually yielded to Lloyd Webber, Mackintosh and Lynne, all of whom were keen on Nicholas for the role. Sarah Brightman, who had already made a name for herself with the chart hit "I Lost My Heart to a Starship Trooper", arranged a private audition and was cast in an as-then undecided role. By December, the full cast had been assembled.