University College London - Research Department of Clinical, Educational and Health Psychology, University College London - Primary Care & Population Health, University College London - Research Department of Clinical, Educational and Health Psychology, University of London - Department of Psychology, Queen Mary University of London - Centre for Psychiatry and Mental Health, University of Exeter - College of Medicine and Health, King’s College London - Social, Genetic and Developmental Psychiatry Centre, King’s College London - NIHR Health & Social Care Workforce Research Unit, University College London - MRC Unit for Lifelong Health and Ageing, University College London - Centre for Outcomes Research and Effectiveness (CORE), Independent, University College London - Research Department of Clinical, Educational and Health Psychology and University College London - Department of Clinical, Educational and Health Psychology