Originally Posted by sib
Seeing as most big organisations seem to have a policy for every eventuality...
(please don't take this post toooooo seriously) 
Has anyone ever read
Down to a Sunless Sea?
It's 1985 and the US is in turmoil after a massive rise in oil prices leads to a total collapse of civilised society.
A BA Jumbo departs a wrecked New York with a cargo of 600 refugees, hoping to make a new life in Britain, a country under martial law but still surviving.
Whilst 2 hours into the Atlantic crossing, the balloon goes up between the USSR and what remains of the USA.
BA Ops in London broadcasts an 'Armada' signal: open the black envelope in the cockpit. Signed by the Chairman and the Flight Operations Director, it says "You're on your own; save as many as you can."
One by one, alternate airfields are blown off the map (including "Bahrein"
). The end of the world is nigh.......
(Oh...GF spray all the time coming into LHR.)