From "Tinker Tailor Soldier Spy: Smiley Sets a Trap (#1.6)"
The message will be, "Have information vital to the safeguarding of the service. Request immediate meeting. Personal." Remember, "Vital to the safeguarding of the service."
It's even true.
Don't forget that. No mistakes, Ricki. Your head's on the block.
Not the only one, Peter.