This morning's national insurance figures have further stoked the debate about immigration, and the extent to which leaving the EU would make a difference. Many British people are concerned that high levels of immigration have hurt their jobs, wages and quality of life. This anxiety is understandable as workers have had a rough ride in recent times. Allowing for inflation, average wages fell by 8 to 10 percent in the six years after the global financial crisis of 2008. Such a sustained fall in pay is unprecedented in British post-war history.
Alongside falling wages, immigration from the EU has been soaring. Between 1995 and 2015, the share of EU nationals in the working age population more than tripled from 1.