Terrorists yesterday struck oil facilities in the US and Saudi Arabia, pushing oil prices to a record $120 a barrel and doubling to $5,214 the expected annual petrol bill for the average US household. Economists warned of the imminent collapse of the US’s economic recovery and a loss of more than 2m jobs, the largest drop since 1945.

While none of this is true, the scenario is thoroughly plausible, according to high-ranking former government, military and intelligence officials who made up the US cabinet in a simulation exercise that is gaining increasing attention from members of Congress, the White House and oil executives.