Source: * International Longevity centre/Royal London, ** Independent studies such as Capital Sigma: The Sum of the Various Sources of Advisor-Created Value, by Jianan Du, Yinsi Qi, Brandon Thomas, Janis Zvingelis of Envestnet, 29/5/15, *** Cheney Goudling / HMRC most recent figures from 2017/18, **** The Office for Budget Responsibility.