Caught this author on Start the Week. "The epidemiologist RICHARD WILKINSON believes that more equal societies produce better health and happiness for all of us, not just the poor. He describes how improving the distribution of wealth contributes to lower crime rates, lower disease rates and less anxiety about status. It can even help to address global warming. His book The Spirit Level is co-authored with Kate Pickett and published by Allen Lane."
Link here where you can listen to the programme he's at the start.