At age 11, she began performing as a child actress on radio programmes, including the part of Bunkle, an extrovert prep-schoolboy on Children's Hour from Manchester, and later worked as an assistant stage manager and acted with the repertory company at the Prince's Theatre in Bradford during high school. Her father died of lung cancer when Billie was 9 years old. Money was tight, and her mother struggled to support the family. "It's something I haven't come to terms with ... I'm rather ashamed of having the good life I have", she later recalled.