Who would have thought that the intricacies of ‘international development aid’ could provoke such an energetic and public war of words? But then who could have predicted Dambisa Moyo, the Zambian ex-World Bank and Goldman Sachs economist with a talent for stirring things up?

As she tours the world with her controversial book Dead Aid – a play on the star-studded efforts of ‘Live Aid’ – she says, ‘my voice can’t compete with a guitar’. Don’t count on it.