In the original draft of the screenplay, Bill Haydon (Colin Firth) had no lines in the flashback scene where Control (Sir John Hurt) and Smiley (Gary Oldman) dispute the validity of Operation Witchcraft. On the day of filming, it was decided that Haydon's silence could be seen as suspicious, and so John le Carré dictated a line over the phone which was transcribed onto a piece of paper and given to Firth right before shooting the scene.

Film

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