Fiona has had a long and notable career, including a variety of stage and screen roles from Shakespeare adaptations to True Blood to, of course, Harry Potter. She is currently on stage in The Testament of Mary, playing the Virgin Mary, who is struggling with the loss of her son. Last month, Fiona also wrote an article for the Guardian discussing her role in the play Electra and how it affected her personally.
Submit your questions for Fiona here! The webchat will take place on Tuesday, May 20 at 1 p.m. BST.