1. Addictions Department Institute of Psychiatry Kings College London London UK
2. Cancer Department of Epidemiology and Public Health Research UK Health Behaviour Research Centre University College London UK
3. Wolfson Institute of Preventive Medicine Barts and The London School of Medicine and Dentistry Queen Mary Univesity of London London UK
4. Mid‐Essex PCT Essex UK
5. St. John of God Hospital Stillorgan Dublin Ireland
6. Central and North West London NHS Trust London UK
7. Addictions Directorate South London and Maudsley Hospital Foundation Trust London UK