Also because it would be a bit silly storing the warheads in the home counties and the submarines in Scotland, generally you try and keep the weapons storage in the same postcode as the delivery system to avoid carting quite dangerous stuff all over the place. Why keep the submarines in Scotland some aggrieved Scot Nat will surely ask, because Faslane is the cloudiest place in the UK which made (makes?) it harder for foreign satellites to count the number of submarines alongside.
Rest assured despite many attempts by the US Air Force no one has yet managed to make a nuclear device go off by accident, it's almost as if they're designed not to.
Biting the hand that feeds IT
