I had wondered about hiatus' question too...and I have to assume CAM had some plan in place for if something happened to him.
Because he 1) blackmailed people who he knew were willing and able to kill and 2) didn't really keep himself that secure physically. And he physically assaulted people, albeit not lethally.
But I also wonder why Mycroft and everyone else couldn't have taken him into custody once they got to Appledore.