In another life, John Hume could have been the visionary businessman who brought bottled water to Ireland. In a different life, he may have become Archbishop Hume or John Hume, Director General of the BBC. Stephen Walker, the guest on this weekend’s podcast, has written an authoritative and detailed biography that conveys the many contradictions of Hume, including the great restlessness inside him which sat alongside a clear vision that rarely altered for more than 30 years. Hume had the idea to bottle water in the 1960s only for it to be dismissed by those around him who asked what…