It won’t simply be food rationing, there will swiftly be rationing of medications and limitations set upon things like elective surgery to stretch the nation’s insufficient reserves while the gov’t fucks around with new trade negotiations. At the same time or shortly thereafter will be the announcement of mass layoffs as companies either owned by other EU nations or reliant upon parts/supplies from EU manufacturers are closed or forced to cope with the sudden backlog of inspections and certifications for every single import. Social order is going to suffer greatly if not utterly collapse when you have thousands to millions of Britons jobless, unable to find food, or watching their loved ones suffer in the NHS queue while the wealthy suffer no shortages or restriction of access.