"Hes already employed by MI5"
No. Old Bat Wings is believed to be subservient to the Black Chamber, by the Black Chamber. In reality, it's the other way around, and has been for decades. The enthronement of the King in Orange in the White House is only the latest move in an aeons-long game.
As for the UK, you don't have to worry about Farage replacing Johnson any time soon. Nyarlathotep has plans for them both, and they involve a tzompantli.
(Yes, I've been reading Charlie Stross' Laundry novels. Why do you ask?)