Our correspondent walked the length of Hadrian’s Wall, in northern England, finding shifting party alliances and surprising views on Brexit. We take a look at the phenomenon of Japan’s hikikomori, who shut themselves in for years on end. And why a plague of rats in California is likely to get even worse. For full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/radiooffer For information regarding your data privacy, visit acast.com/privacy