From Greenland’s icy mountains, from India’s coral strand, as the old hymn has it, we seem to inhabit a world that is more seriously troubled in more places than many can ever remember. In the UK, national morale feels all but shot. Politics commands little faith. Ditto the media. The idea that, as a country, we still have enough in common to carry us through – the idea embedded in Britain’s once potent Churchillian myth – feels increasingly threadbare.