Alex Copello is Professor of Addiction Research at the University of Birmingham and Consultant Clinical Psychologist at Birmingham and Solihull Mental Health Foundation Trust. Jim Orford is Emeritus Professor of Clinical and Community Psychology at the University of Birmingham. Ray Hodgson is Director of the Alcohol Education and Research Council. Gillian Tober is Honorary Consultant in Addiction Psychology, Head of Training and Clinical Services Manager at the Leeds Addiction Unit.