Two weeks after a ‘severe’ no-deal Brexit, the country would be running out of petrol

Britain would be hit with shortages of medicine, fuel and food within a fortnight if the UK tries to leave the European Union without a deal, according to a Doomsday Brexit scenario drawn up by senior civil servants for David Davis.

Whitehall has begun contingency planning for the port of Dover to collapse “on day one” if Britain crashes out of the EU, leading to critical shortages of supplies.

Last month officials in Davis’s Brexit department and the departments of health and transport drew up scenarios for a no-deal Brexit — a mild one, a severe one and one dubbed “Armageddon”.

A source said: “In the second scenario, not even the worst, the port of Dover will collapse on day one. The supermarkets in Cornwall