Millar made her debut in theatre in 1952, in a production of
Babes in the Wood with comedy duo
Morcombe and Wise at the Empire Theatre, Sheffield at the age of 16. She began her
West End career in 1962 as Cloris in
Lock Up Your Daughters. In 1969, she played the title role in the musical
Ann Veronica, based on
H. G. Wells's novel. In 1986, Millar originated the role of
Madame Giry in
Andrew Lloyd Webber's musical
The Phantom of the Opera. She played the role for four years and her voice appears on the original cast album. Millar remained with the programme until its end in 1995. From 1997 to 1998, Millar played Mrs Potts in the London production of
Beauty and the Beast. She also appeared on the cast album. In February 1998, Millar left the show because of deteriorating health. ==Personal life, illness and death==