Ian Curteis' acclaimed play tells the story of the three Russian spies who penetrated the British Foreign office. The play covers the period from 1945 - the date of the Volkov Incident - to 1955, when Kim Philby was cleared of being the Third Man in the Burgess and Maclean spy scandal.

The distinguished cast includes Anthony Bate as Kim Philby, Derek Jacobi as Guy Burgess and Michael Culver as Donald Maclean.

Interview: Ian Curteis talks about why he thinks the play was such a hit in 1977 and why it's still relevant today.