The job of the SSBNs is straight forward. Deterrence. Knowing that if some nation launches a nuclear attack against your country, a force will remain at sea that can hit you with a devastating counterblow.Your list of RN tasks is impressive but what is the purpose of the SSBN's? Deterrence of any other country? If in twenty years time London thinks it necessary to attack say Kenya and that country has one nuke which it brings to the Thames and explode at sea level during an Easterly wind: Forget about London, will it repair the honor of the UK to launch one to three submarine loads, 16 to 48 missiles against that country?
So, yes, in your scenario, if the government of Kenya (or any other) thinks to get involved with a plot to attack England with a nuclear weapon, they will know that they are going to get annihilated.
Honor and chivalry has nothing to do with it. After such a scenario, England will be hurt but is likely to survive. Kenya would never be a power to be threatening anyone again and the deterrence message will be punctuated. England still able to deliver on it.
Deterrence like this actually works with rational people and governments. It does not work against irrational thinkers like terrorists and religious extremists who think that by killing a million infidels they are going to Heaven and do not care what happens to their own country.
So, deterring those people is not the SSBN's job. That is left to other arms of the military while the SSBNs continue to deter those they were meant to deter.
Diffferent missions...different AORs.
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