Subscribe to FT.com here: Tamsin Greig plays Malvolia in Twelfth Night at the National Theatre. We talk cross-gender casting with . The actor reflects on the challenges and rewards of playing Malvolia in Twelfth Night. The whole of Illyria has come down with a bad case of unrequited love. Watch the trailer for our production of Shakespeares comedy, featuring Tamsin Greig as .