It starred George Baker, Barbara Shelley, Peter Wyngarde, John Phillips, Tristram Jellinek, Sally Home and Derek Blomfield.
It was recorded at the BBC Television Centre in Wood Lane, west London.
[1] Three years after the events of the Prisoner of Zenda, Queen Flavia writes to her true love, an Englishman named Rudolf Rassendyll.
The letter is intercepted by Rupert of Hentzau, an out-of-favour aristocrat, who sees a chance of re-establishing himself at court by bringing news of the letter to the Ruritanian King.
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