Surely the EU is nothing more than the political equivalent of a cartel. And there is general acceptance that that is a bad thing. As was stated already - Britain should never have joined in the first place.
When Britain joined, she effectively abandoned the commonwealth countries. The EU demanded, for example, that all trading should be done with them and so contracts were simply cancelled. NZ, for example, were simply kicked into touch and our contracts with Britain to buy our primary produce such as butter were simply cancelled. We were in deep trouble for a while as a result. Did Britain (or that useless person sitting on the throne) do anything? Or even care? Nope. We were abandoned. Yet the royals have the cheek to continue travelling around the commonwealth as if we still matter to them. Talk about two-faced! Man, I'm still angry about that.
If you look at the financial manipulations around the broke countries such as Greece, you will see that the so-called financial assistance is rubbish. Loans structured such that Greece will never recover. It is all part of the manipulation for financial control by the banking community.
I believe that soon (in 2017?) you will lose control of your police and armed services. Why on earth would any country allow that to happen? Leaving will hurt but that is the price of the mistake that was made by joining. Soon there will be nothing left of the Great in Great Britain. It will just be Britain - one of the subjugated sovereign states.