The naïveté of some people is amazing - do you not read about what’s happening right now in terms of Brexit?
Yes, the UK manufactures food - not nearly enough to feed the population of the U.K., however. Where do you think all the ingredients for food and medications made in the UK come from - all grown and produced in the U.K.?
At present we send a significant percentage of our livestock to be slaughtered in Europe because we don’t have enough slaughterhouse capacity, and then it gets shipped back. Most of the fruit and much of the veg we eat is produced abroad. If just one ingredient in a processed food comes from abroad, the production of that product will be affected.
What do you think happens is there are (pretty much inevitable) issues with customs in the event of No Deal? Why do you think so many people who know what they’re talking about are so opposed to this? Have a look in your fridge and cupboards and see what you think you’d be able to get.
If you’re not holding stocks of enough food / essentials to get through at least a tough couple of weeks, you’re a fool.
I don’t believe it will be Armageddon but think about the things that could be impacted by a severe backlog at customs (food, medicine, fuel, other essentials produced abroad, trucks stuck in queues rather than delivering things, so a truck that’s due to make a two day trip to Europe and then come back and do multiple other jobs may not be able to get out / back and that has a knock on effect to everything else).
Stocking up on tinned and dried goods is so easily done if you can afford to - why wouldn’t you do it just in case, when the likelihood of an issue is so high?
OP, I guess it really depends on the situation by Easter - if everything has gone to shit and everyone is living on their stockpiles then it would be more than reasonable I guess. Maybe buy extra of those things now just in case.