Okay, suppose there were a vote of No Confidence being held - every single MP is there - and the Houses of Parliament were to get hit by a meteorite, killing everyone. Suppose also that there were a contentious piece of legislation going through the Lords, so they're all dead too. To whom would government devolve? Obviously, Brenda is still Head of State, and elections need to be held, but in the interim, but what does she do? Does she call what's left of the Privy Council? Who governs? Who would become acting Prime Minister?