Which screw ?
In the event that the Leave campaign win I cannot see a positive outcome.
If we do not agree to abide by E.U. laws and accept the free movement of people then we will be denied access to the European free trade area. That means that all of a sudden 50% or so of our exports will be subject to tariffs on entry to the EU and all kinds of extra red tape to demonstrate that they, and all their components adhere to EU standards. We would end up less competitive in Europe and as far as I can see no more competitive in the rest of the world (unless we're suddenly going to reduce wages, employee safety or environmental standards - none of which sound like a "win" to me). In this model the big winners are people like James Dyson who may be able to import his Malaysian manufactured vacuum cleaners into the UK slightly more cheaply.
The alternative model is one in which we opt to remain in the EU free trade area which means that we will be subject to all the rules, have to pay the same "dues" in terms of EU contributions but not receive any funding back from the EU and not be able to influence any of the legislation by which we would have to abide (and probably lose our opt-outs in the process).
The Leave campaign have suggested that we would be able to get some kind of sweetheart deal in which we get all the benefits of EU membership with none of the obligations or costs. This is sheer fantasy as the EU, those familiar with EU law and pretty much all other economic and legal experts agree. People like Dyson and Bamford accept that this is the case but for them it's a price worth paying, in Dyson's case to be able to import to the UK more cheaply, in Bamford's case he's hoping for great deals in the Far East (good luck with that btw).
I don't even know who is supposed to be the winners in the event of a Brexit....
In an attempt to become more "competitive" (i.e. cheaper) post Brexit, U.K. business will trim its cost base which means some combination of lower staff costs, worse working conditions and worse environmental controls. I cannot see how this is a "win" for workers or the public.
When imports from the E.U. become more expensive (as they will in the Farmers' fantasy), that will increase prices overall. In an environment where wages are already being squeezed to make us more "competitive" then it'll be even harder for people to make ends meet.
Ah, but fewer people will mean that houses will be cheaper. Well yes, if you're waiting to get on the property ladder then that MAY be good but because wages will be being squeezed to make us more "competitive" and because interest rates will have to rise to address the tariff induced inflation (unless we're also going to ask the Bank of England not to worry about that

), houses may actually be less affordable (say if prices only drop 20% but interest rates go from 3% to - still below the long term average - 4.5%) so those waiting to get on the property ladder will worse off and millions with home loans will be in negative equity - how is this a "win" ?