I know, while we'll have our own pet theories, we just don't know what we're going to get. My missus is a wool hoarder which I encourage, again, one of those things that ain't exactly going to go off and if you have the space, why not. She's less tolerant of my hoarding preferences but hey ho.
I don't see prepping for Brexit as any different to 'normal' prepping. The only big difference is we KNOW that Brexit is on the horizon as opposed to the numerous other things to prep for. I try and prep to keep my household running as normally as possible. While its not feasible for me to do everything, I try and find work rounds for things. Those light bulb things I posted earlier were inspired by a camping trip with Brambles so I got some for 'every day' prepping, the first ones I got were about £1.30 so they've gone up (same as a LOT of things). Whether the lights go out because of Brexit or zombies, the lights will be out so I'll need alternatives. Same with the mains gas, I'll still want to eat so I've camping stoves (many, many in my case) but I've upped the fuel I keep for them.
Food ? We'll know what we like and where it comes from. One thing to consider is even if its domestically available like tatties then if less people can afford pasta or rice then they'll want more tatties. Supply and demand could well push up the cost of stuff we wouldn't expect. Not trying to scare anyone, just something that may be a factor. The flip side being that behind the scenes, the Government is beavering away making all sorts of 'pre' trade agreements and a matter of days after Brexit, some new arrangements are announced, it would make sense if they could swing it to soften the blow and get people to vote for them (cynical.... moi ????). It could all be another Y2k, who knows.
Hoping to get more stocks in the US as Lion Brand is my yarn of choice and as it's American it's cheaper there. Especially with a coupon. 
Its all very well having torches up the yin yang but for day to day living something like this will be better, especially if you can hang it from your normal light.
I guess its not just a handful of 'oddballs' that are prepping now, the 'middle classes' (hate using class descriptions but it was the tone of the articles I was reading) are getting in on the act, after a quick google there's quite a lot of 'serious' journalists advocating it with nods towards olive oil and capers etc but still having the prepping message.