Rupert Everett has previously played the lead in another film based on the story of the Cambridge Spies, Another Country (1984), in which his character was based on real life spy Guy Burgess.
There's evidence of someone they call agent Virgin, maybe a convert.The main source of the leak is someone who works inside the foreign office in London and his code name is Homer.
One of the shots of Moscow in the 1960s shows The Cathedral of Christ the Saviour. It was destroyed by Stalin in the 1930s, and rebuilt during the 1990s. In the 1960s an outdoor pool would have been in its place.
The opening credits appear on the screen in the fashion of text typed and displayed on a very early computer, during scenes showing events taking place a decade before the time the film is set in.
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