Russell Mannion is a Senior Research Fellow at the Centre for Health Economics, University of York. He is also Director of the Masters course in Health Economics at the Nuffield Institute for Health, University of Leeds. Huw T.O. Davies is Professor of Health Care Policy and Management at the University of St Andrews, and a former Harkness Fellow in Health Care Policy when he was based at the Institute for Health Policy Studies at the University of California, San Francisco. He is Co-Director of both the Centre for Public Policy and Management (CPPM) and the Research Unit for Research Utilisation (RURU) in the School of Social Science at St Andrews and is Associate Director of the PharacoEconomics Research Centre (PERC) at the same place. Martin Marshall is a Professor of General Practice at the National Primary Care Research and Development Centre at the University of Manchester, and a part-time general practitioner in an inner city practice.