One of the most important but least explored divisions in British politics is the way that people of different ages feel very differently about the same issues. YouGov data show immigration is the issue that most concerns voters as a whole, beating the economy by 55 per cent to 51 per cent. But dig deeper and important differences emerge. Among people aged between 18 and 24, immigration is actually only the third most important issue, named by only 31 per cent as their prime concern. People between 25 and 39 also rate the economy above immigration. Among over 60s, however, the arrival of foreigners is the greatest worry: 67 per cent say it’s the biggest issue for Britain.