The actor has joined Phoebe Waller-Bridge's acclaimed spy thriller for its third season. She talks to Alexandra Pollard about the joy of not wearing a corset, the limitations of Shakespeare's heroines and why she thinks people should think carefully before changing their pronouns

The first images of Harriet Walter Tamsin Greig, and Ella Purnell were released by ITV on Wednesday, which saw the stars dressed in their finery for the period drama.