I think this is just a taste of what’s to come, tbh. Just come visit Norway if you want to get an idea of what food costs if you’re operating outside the Common Agricultural and Fisheries policy.
It’s good from the point of view that your country is more self-reliant (assuming you’re set up to mostly produce food at home, which the UK isn’t).
It’s bad from the point of view that food costs 3 to 4 times as much and there is nothing like the variety available that you are used to.
It also helps if your country is the richest in the world, and has a heavily unionised workforce and strong social security safety net.
Neither of which applies to the UK, I believe?