We’re all slowly becoming aware that there’s a new migrant crisis. Last week Jon Donnison of the BBC, cruising the English Channel looking for asylum-seekers heading to the UK, found four young men, paddling by hand their tiny rubber dinghy. They’d come from Sudan via France, and for the last leg of their journey they’d dodged the oil tankers and container ships ploughing the world’s busiest shipping lane; only one of the young men even wore a life jacket.