Apparently we are going to experience a food shortage while our farmers simultaneously go out of business.
Crops magically walk to the shops all by themselves don't they?
One of the features of some of the biggest famines in history there have been is not due to a shortage of what food there was. It was stuff like the government taking their 'tax' or because the goods have rotted where they are having never reached their destination for whatever reason. Or because whilst there has been the land and labour available, there hasn't been the skills to grow crops efficiently.
For example during the Irish Potato Famine, there was enough food produced to feed double its population. Also see the famine in 1832 - 33 in the Soviet Union.
It's politics rather food supply. And Brexit also contains issues over quantity of food.
As a nation many of the population lack the skills to be able to cook anything to survive. It's stuff like we export offal to Spain because we don't eat it as a nation and don't know how to prepare it even if we had to.
There's been horror at how few vegetables some children can even identify because of how we are so out of touch some parts of the community are with cooking from scratch.
In reality, people who think to stock up on things like tinned tomatoes have a greater knowledge and thus greater ability to cook.
I hope, sincerely that those who think others are simply 'hysterical' are the ones who are right because if the converse is true it could well result in civil unrest.