The Culture Which Is British (not USSR or USA)

With apologies to Marginal Revolution where Tyler Cowen has posts beginning: "The Culture Which Is...", here's a link to a Politico piece on how the UK handles Doomsday: if it's Armageddon and the government is decapitated, what does the prime minister want the commanders of its nuclear deterrent to do?  Very interesting, as well as the quick comparison with the USSR and USA's plans for the same contingency.