Advertising guru Kevin Allen tells a tale of missing cutlery on passenger jets to show where business leaders go wrong. Success, he says, belongs to the "buoyant" leader, riding high on the esteem of the workforce, rather than ruling by fear.

Four Thought is a series of thought-provoking talks combining personal stories with ideas of contemporary relevance. Speakers air their thinking in front of a live audience, hosted by David Baddiel.