Cherie Lunghi plays Lillian Webster in this episode. She returns in episode 18.4, A Dying Art (2016), in the role of Alexandra Monkford.
Henry Cavill and David Bradley both appear in The Tudors (2007), though not on screen together. Cavill appeared in all episodes as "Charles Bradley," while Bradley appeared in only one episode Problems in the Reformation (2009) as "Will --- Court Fool."