"Supporters of a hard Brexit will no doubt see this as yet another scare story. But their opinion that everything will be alright, that we will weather this storm as we did the Blitz, is a form of magical thinking. This is what happens without trade deals. It is analogous to having no money and no access to a supermarket – the fridge and presses will not fill up by magic. Without a trade deal the UK will run out of food. This is an economic and mathematical certainty. The time to “wake up” has come and gone. This is not a drill. If things continue as they are – and it looks like they will – we will be faced with extreme food and pharmaceutical shortages and people will die."