Freedom of movement is a central pillar of the European Union – and the one that British voters rejected in the referendum. Sophie Moullin argues that we need to recognise why some people – particularly the white working-class – do not want to move, and resent being told that migrants work harder than they do. But this instinct is not something we should accept as laudable or even inevitable. It stems from deep inequalities in British society.

‘Sheffield’, he echoed with a snort, when I said where I was from.

Someone tried to...