Clinton Huxley wrote:One of the first acts of a new British Prime Minister is to write 4 copies of a letter called "The letter of last resort". One copy of this letter is then placed in each of the 4 Trident submarines that carry the UK's nuclear deterrent. One of these subs is always on patrol. No-one but the PM knows what is in the letters
and the previous PMs letters are destroyed unopened upon the election of a new PM. The letter is to be opened by the submarine captain if they believe that the UK has been destroyed by a pre-emptive nuclear strike. The letters are thought to contain ONE of the following 4 commands, the option being up to the PM:-
1) Retaliate against the enemy
2) Do NOT retaliate against the enemy
3) Captain to use own judgement
4) Place the submarine, if possible, under the control of a friendly power, either the USA or Australia.
The "letter of last resort", if opened and acted upon, would constitute the very last act of the British state.
What would you do? Personally, I'd opt for option 4. Seems no point in retaliating, deterrence has already failed and there's no point adding to the destruction.
Australia? Why Australia? The Canadian forces already operate submarines, have a real army, and are just better positioned to put those subs to use.
I'd go for a fifth option.
5) Place the submarine, if possible, under the control of a Commonwealth power, preferably a militarily competent power like Canada. If not possible, retaliate against the enemy.