Charlie Stross has just saved me the trouble of writing another Brexit screed. He makes a lot of sense. Go read it.
I am so tired of talking to people in the UK who wilfully refuse to believe the coming shit storm*, who insist, “Oh, the government would never let that happen to us!” They are mostly white, middle-class, nondisabled straight Christians; they won’t be first against the wall. They are the people who voted Leave. They’re used to being Us, not Them. (Those of us who have been Them all our lives are much less sanguine.) Even so, if I were them I’d be stockpiling food, meds, and fuel. If I had room for stockpiled fuel, I’d buy a generator. I’d cancel plans for travel anytime after February 2019. And I’d be very, very glad that, when the unrest comes, there aren’t more guns in the hands of UK citizens.
For those in North America and Europe (and every other continent for that matter), remember that the more complex and intertwined a system becomes, the easier it is to break. And civilisation is extraordinarily complex. Short term, what happens here after Brexit will be nothing like the UK. Long term? You might want to start looking at your supplies.
* Just eight months to go…
Nicola Griffith 
I’m not certain that stockpiling supplies is a productive strategy as I’m not sure survival for a few more days or months is worth the effort, Nicola.
The problem for stockpiling meds is the UK works solely on the prescription system for anything much beyond an aspirin, and even in circumstances where a private (i.e. paid at full cost outside of the NHS) prescription might be possible, GPs and pharmacists aren’t really on board with stockpiling. And if your medication is a controlled drug, as mine is, then opportunities for sourcing it elsewhere are effectively zero (opportunities for being banged up for trying are somewhat higher). I’ll simply be miserably in pain and far more disabled if we can’t source opioids, but for friends who are, for example, reliant on insulin, which isn’t manufactured anywhere in the UK, and which needs refrigeration, the stakes are far higher.
I hear you. If you can source opioids at least they have an extended shelf life. Insulin, even unopened and refrigerated, does not last long. I worry for people, I really do.
I used to keep a year’s supply of insulin on hand but if I lost refrigeration for very long it would all go bad. I know our genome is coded for survival but perhaps simple survival is something the new Homo will be better without.