PROFESSOR SPROUT      The amiable Herbology professor demonstrates the fine art of repotting and growing Mandrakes, which prove vital to those Hogwarts students unfortunate enough to cross paths with the Chamber of Secrets monster.      MIRIAM MARGOLYES easily moves from throwing Arnold Schwarzenegger into a wall in End of Days to playing 23 characters from the works of Charles Dickens in her award-winning one woman show (Dickens' Women), Miriam Margolyes is one of the UK's most prolific and versatile actresses equally at home on stage or screen. She went to the US following an award-winning performance in Christine Edzard's film Little Dorrit appearing four times on the Tonight Show, before being given her own situation comedy Frannie's Turn.      In 1984 Margolyes won the BAFTA Award for Best Supporting Actress for her role in Martin Scorsese's The Age of Innocence prompting an invitation to join the American Academy of Motion Picture Arts & Sciences. Other films include: Pacific Heights; Dead Again; I Love You to Death; Cold Comfort Farm; Immortal Beloved; Little Shop of Horrors and James and the Giant Peach; Baz Luhrmann's William Shakespeare's Romeo and Juliet; Sunshine and Cats & Dogs.      Her television career is equally as varied with highlights including: The Girls of Slender Means; Glittering Prizes; Blackadder; Old Flames; The History Man; Oliver Twist; The Lost Tribe; Life and Loves of a She Devil; Vanity Fair; and Lynda La Plante's Supply and Demand.      Her greatest love is the theatre, including most recently the Vagina Monologues. Her first appearance at the Arts Theatre was in the 1976 hit Kennedy's Children with other appearances including: The Threepenny Opera; Orpheus Descending both with Vanessa Redgrave and She Stoops to Conquer with Sir Donald Sinden. Her production of Gertrude Stein and a Companion won a Fringe First at the 1986 Edinburgh Festival, transferring to a sellout season at the Hampstead Theatre and a US and Australian tour. Her last West End appearance was as George in The Killing of Sister George and the Ambassador Theatre and in 2000 in Los Angeles, she appeared in Sir Peter Hall's production of Romeo and Juliet.      Margolyes's career began in radio with parts ranging from voicing small boys to old ladies. She has voiced thousands of TV and radio commercials, recorded stories for children including Matilda; The Worst Witch; Pinocchio; The First Snows of Winter; Mulan and the voice of Babe's mother, Fly, in Babe. Her radio career was crowned in 1993 when she recorded The Queen & I for the BBC, playing every member of the royal family. This was released on cassette and became the most popular audio book ever issued, for which she won the Sony Best Radio Actress Award. In 1997 Margolyes' recording of Oliver Twist won awards in both England and the US and she was named Best Audio Performer by the Spoken Word Publishers Association.