Rosemary studied at The Royal Academy of Music and the London Opera Centre. She appeared in Pantomime at The Player’s Theatre and in the London production of The Magic Flute. She sang the role of Marie Regnault in Taverner’s Thevese at Covent Garden and played Despina in Cosi Fan Tutte for Sir Geraint Evans’ Masterclass on BBC TV 2. She played Cunegonde in Bernstein’s Candide at the 1981 Edinburgh Festival and then at The Birmingham Repertory Theatre. This was followed by Nickleby And Me at The Chichester Festival Theatre and Side By Side By Sondheim at the Manchester Library Theatre. She went back to New York to sing in the English musical Pudding Lane. She toured Wales singing for the Welsh National Opera in Dear Ivor, a show about the life and works of Ivor Novello. She played Janet in The Rocky Horror Show at The Nottingham Playhouse and returned there to play Maria in West Side Story.
On BBC 2 she appeared in Jonathan Miller’s production of The Beggar’s Opera and is a regular broadcaster on BBC Radio’s Friday Night Is Music Night, Among Your Souvenirs, Melodies For You and others. At The Wexford Festival she played Marionetta in Wolf-Ferrari’s opera The Cunning Widow. At the Theatre Royal, Nottingham she appeared in The Gondoliers and played Hortense in The Boyfriend at Bromley followed by Manchester, Toronto, The Old Vic and Albery Theatre in the West End. In 1985 she appeared in Arabella and Akhnaton at The Coliseum, London.
In the Autumn of 1985 she played Despina in Cosi Fan Tutte for BBC TV directed again by Jonathan Miller and Princess Yum-Yum in The Metropolitan Mikado for Ned Sherrin at The Queen Elizabeth Hall, South Bank. She recently played Nell Gwynne in a Channel 4 film, starring Timothy West as the diarist John Evlyn.