if the logic described re. spy-lore is behind a certain shell-game, here.
(Personally I think that GG is smart enough to know that He Doesn't Know enough spycraft to out-sleuth the sleuths.)
I'd think that he has been assisted/tutored by some?/enough? crypto-ept folk / and is also smart enough to have followed their Rx implicitly.

But what do I know-- or, thus far, the UK sleuths??
What was that movie w/Michael Caine re recursive simultaneous murder plots/nope-a-ploy!/then more plots ... ..?

Hey! maybe it Was.. Sleuth!
er, qed