Smiley and Oliver discuss Control's death in Tinker Tailor Soldier Spy
George Smiley: I'm retired Oliver. You fired me.
Oliver Lacon: The thing is, some time ago, before Control died, he came to me with a similar suggestion. That there is a mole. He never mentioned his suspicion to you?
No.
No, I just thought since you were his man, so to speak.
What did you say to him?
Well, I'm afraid I thought his paranoia had rather gotten the better of him. He was going to put his whole house down. That bloody mess in Budapest. Dammit George. It's your generation, your legacy. I would've thought if there's any truth in this, then he'd want to, eh...
Clip with Simon McBurney as Oliver Lacon and Gary Oldman as George Smiley.
