Based on the same real life events as Another Country (1984), Cambridge Spies (2003), History in Faces: Cambridge Five (2011), Philby, Burgess and Maclean (1977), Screen One: A Question of Attribution (1991), An Englishman Abroad (1983), Tinker Tailor Soldier Spy (2011), Screen Two: Blunt (1987), Play for Today: Traitor (1971), Blade on the Feather (1980), The Jigsaw Man (1983) and influenced the source novels of The Fourth Protocol (1987), The Innocent (1993) and others works such as A Different Loyalty (2004) and The Crown: Olding (2019), even in minor form like in The Imitation Game (2014).
I still believe the secret services are the only real expression of a nation's character.
In episode 6, Bill Hayden writes a cheque for his girlfriend and tears it out of the cheque-book. He then writes her name and address on a slip of paper. In the next shot he is shown ripping a (blank) cheque from the cheque-book and handing it to Smiley along with the slip of paper.
SPOILER: The closing credits scroll over a scene of Oxford, which is chronologically where the spy was recruited in the story.
The American DVD edition is a syndicated edit comprised of six episodes instead of seven.
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