[Alan and Joan meet with Menzies to tell him about keeping the decrypted Enigma intercepts secret]

Why are you telling me this?

We need your help, to keep this a secret from Admiralty, Army, RAF, uh...as no one can know, that we've broken Enigma, not even Dennison.

Who's in the process of having you fired.

You can take care of that.

While we develop a system to help you determine how much intelligence to act on. Which, uh, attacks to stop, which to let through. Statistical analysis, the minimum number of actions it will take, for us to win the war - but the maximum number we can take before the Germans get suspicious.

And you're going to trust of this all to statistics, to maths?

Correct.

And then MI6 can come up with the lies we will tell everyone else.

You'll need a believable alternative source for all the pieces of information that you use.

A false story, so that we can explain how we got our information, that has nothing to do with Enigma, and then you can leak those stories to the Germans.

And then to our own military.

Maintain a conspiracy of lies at the very highest levels of government. [Lights a cigarette]...Sounds right up my alley.