In reply to alfadriver:
The EU you describe - ie, the level playing field with the free movement of goods and workers - is the one that was sold to my generation, and pretty much all of us believed in it. And we like(d) it, because a lot of us remember what a pain in the posterior it was to move to another country if you wanted to. When I was at university a friend of mine and I were looking at buying a cottage across the border in France as it was within commuting distance and would've cost us about a year's rent(!) to buy, but at that point in the late 80s the requirements to settle in France pretty much prevented this from working. A few years later it would've just been a matter of moving there, registering with the local authorities and job's a good 'un.
IMHO the problems started really with the currency union without the necessary political union. That exposed a lot of the issues in the construct of the EU and leaves people with the somewhat correct impression that it's a rather undemocratic institution by design. I think the EU politician of older times were at least better at pretending to listen to the people of the EU than the current lot, whose only answer is "more integration and more bigger sticks for people who disagree with us" (like Greece...). That didn't help. I still think the smartest thing that Blair and Brown as the chancellor did was to stay out of the Euro.
That said, there's always been a right fringe of the Tory party that wants to party like it's 1850 and hasn't quite got over the loss of the Empire, if they even acknowledge that it was lost in the first place. Both Boris Johnson and Michael Gove were "journalists" (quotes intentional) whose reporting and opinion pieces especially in certain Murdoch-owned newspapers pandered to that fringe and explained every perceived negative point as being the fault of the EU, including the weather. People used to laugh at that but I guess about 25 years of that crap and it took root. Combine that with a fair number of areas in what used to be the industrial heartland that never recovered from the deindustrialisation that was a result both of the labour issues in the 1970s and Maggie's attempt at "modernising" the economy and you do get enough people believing that it's not really possible for things to get worse when you leave the EU.
Heck, there were (and AFAIK are, but I haven't been in that area for about four years) places around Manchester, Bolton and Liverpool that look like Detroit, and not the refurb'd hipster parts of Detroit.
Re the "immigrants taking our jobs, money and women", well, let's just say that when the people from Poland were allowed free movement in Europe, a bunch of tradespeople showed up in the UK. One suddenly find a plumber who would show up on time and actually fix E36 M3, which was clearly unacceptable. Funnily enough the Polish economy improved and most of them went back. Admittedly it didn't help the already depressed wages of tradespeople, at least not for a short amount of time until the immigrants had built a reputation that allowed them to basically charge the same. But to be fair to people, in some of the really depressed areas you can't even get an apprenticeship in a trade, so unless you somehow do really well in a E36 M3ty school and somehow manage to do to university, there isn't much of a way out.
Plus wages in the trade aren't that great either - I paid about 2/3rds of the US cost per hour to competent mechanics over there (that's independent shop vs independent shop), in a semi-affluent area and an economy where taxes are considerably higher than over here. If you're a professional you can generally make pretty good money, but if you're a working-class stiff who's good at his trade, it's not that great. Heck, some of the restoration work a friend's bodyshop did on my cars was farmed out to people who worked for Rolls Royce and still had side gigs despite being recognised as being amongst the best you could find.