And why is there such high immigration to the UK from the EU? Perhaps because numerous economies within the EU continue to suffer with high unemployment, especially high youth unemployment which has forced their citizens to move to more functional economies, the UK being one.
If the euro crisis had not happened or at the very least had been solved within some reasonable timeframe then I doubt we would have had an EU referendum in the UK. The EU looked and still looks incompetent in its handling of the issue which in very large part lead to the rise in UKIP popularity which ultimately created the pressure for a referendum.