John Lanchester: 'Walls were coming down around the world - now they are springing up'

His last novel Capital skewered the property bubble, now his latest The Wall imagines Britain barricaded after environmental catastrophe. Lanchester talks about refugees, Brexit - and optimism Desperate refugees risking their lives crossing the Channel in small boats in the dead of night; extreme temperatures forcing people to flee their homes; politicians inciting a fear of others, and railing against traitors who "want us to be overrun, to be washed away". These are not recent news stories, bu...