Earlier quoted context omitted.
Yawn. The W177's were secured with bike locks ... inside a reinforced concrete bunker surrounded by razor wire and patrolled by armed guards with orders to use lethal force to stop anyone trying to gain access to them without proper authorization. Just like the USSR's land-based ICBMs didn't have PAL codes -- instead they were guarded by a platoon of KGB troops who didn't know how to launch the missile, but sure knew…
Well, not necessarily. A rogue commander could probably persuade his subordinates that he was authorized to use the bicycle key. If someone in a position of apparent authority claims that they will accept responsibility, subordinates will usually go along with that.
The WE.177 was not a sub-launched missile. The Royal Navy's Trident D5s (which come from the same maintenance pool as the US Navy's missiles) are; they do not, as far as I know, use bike locks: if they do, so do the USN's D5s.