When you say the NATO command structure - do you mean we a political command structure, or an actual physical one, e.g. there's a NATO guy in the physical process of launching who can stop it?
Surely if there's only a UK commander on a submarine and he's given the order, there's no physical means of intervention? (or is there? - is he physically capable of launching without any intervention / unlock codes from NATO etc?)
Imagine a rogue commander of the sub, with sole capability to launch - that seems odd.
At an absolutely wild stab in the dark.... I would have thought that EVEN if the the missiles were launched, there might be some secondary acknowledgement required whilst airborne to 'unlock' the bmb as such. That way, even an accidental misfire, or rogue commander couldn't make it happen - the missile would need a secondary confirmation via satellite or something.
Anybody know?