Martin Cave is Professor and Director of the Centre for Management under Regulation at Warwick Business School. He is the author of the 'Cave Report' commissioned by the Chancellor into spectrum management in the UK. Chris Doyle is a Senior Research Fellow at the Centre for management Under regulation at Warwick business School. William Webb is Head of Research and Development and Senior Technologist at Ofcom, a Visiting Professor at Surrey University and Fellow of the Royal Academy of Engineering.