In an interview with the Financial Times a few months ago Allan Clarke the new CEO of SABMiller described his leadership style as encouraging discussion. This is not a young Silicon Valley outfit, where you might expect to see an informal and personal leadership style, but with the world’s second largest brewer, with a turnover in excess of $22bn a year. Clarke is one of a growing group of business leaders who see conversation and dialogue as being at the heart of their leadership style.