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Andrew I Gumley, Simon Bradstreet, John Ainsworth, Stephanie Allan, Mario Alvarez-Jimenez, Maximillian Birchwood, Andrew Briggs, Sandra Bucci, Sue Cotton, Lidia Engel, Paul French, Reeva Lederman, Shôn Lewis, Matthew Machin, Graeme MacLennan, Hamish McLeod, Nicola McMeekin, Cathy Mihalopoulos, Emma Morton, John Norrie, Frank Reilly, Matthias Schwannauer, Swaran P Singh, Suresh Sundram, Andrew Thompson, Chris Williams, Alison Yung, Lorna Aucott, John Farhall & John Gleeson.

Andrew I Gumley ^1,*, Simon Bradstreet ¹, John Ainsworth ², Stephanie Allan ¹, Mario Alvarez-Jimenez ^3,4, Maximillian Birchwood ⁵, Andrew Briggs ⁶, Sandra Bucci ^2,7, Sue Cotton ³, Lidia Engel ⁸, Paul French ⁹, Reeva Lederman ¹⁰, Shôn Lewis ^2,7, Matthew Machin ¹¹, Graeme MacLennan ¹², Hamish McLeod ¹, Nicola McMeekin ¹, Cathy Mihalopoulos ⁸, Emma Morton ¹³, John Norrie ¹⁴, Frank Reilly ¹⁵, Matthias Schwannauer ¹⁶, Swaran P Singh ⁵, Suresh Sundram ¹⁷, Andrew Thompson ^3,5, Chris Williams ¹, Alison Yung ², Lorna Aucott ¹², John Farhall ^18,19, John Gleeson ²⁰

¹ Institute of Health and Wellbeing, University of Glasgow, Glasgow, UK
² Division of Psychology and Mental Health, School of Health Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
³ Orygen, The National Centre of Excellence in Youth Mental Health, Melbourne, VIC, Australia
⁴ Centre for Youth Mental Health, University of Melbourne, Melbourne, VIC, Australia
⁵ Division of Health Sciences, Warwick Medical School, University of Warwick, Coventry, UK
⁶ Department of Health Services Research and Policy, London School of Hygiene & Tropical Medicine, London, UK
⁷ Greater Manchester Mental Health NHS Foundation Trust, Manchester, UK
⁸ School of Health and Social Development, Deakin University, Melbourne, VIC, Australia
⁹ Department of Nursing, Manchester Metropolitan University, Manchester, UK
¹⁰ School of Computing and Information Systems, Melbourne School of Engineering, University of Melbourne, Melbourne, VIC, Australia
¹¹ Division of Informatics, Imaging and Data Sciences, School of Health Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
¹² Health Services Research Unit, University of Aberdeen, Aberdeen, UK
¹³ Department of Psychiatry, Faculty of Medicine, University of British Columbia, Vancouver, BC, Canada
¹⁴ Usher Institute, University of Edinburgh, Edinburgh, UK
¹⁵ Scottish Recovery Network, Glasgow, UK
¹⁶ School of Health in Social Science, University of Edinburgh, Edinburgh, UK
¹⁷ Department of Psychiatry, Monash University, Melbourne, VIC, Australia
¹⁸ Department of Psychology and Counselling, La Trobe University, Melbourne, VIC, Australia
¹⁹ NorthWestern Mental Health, Melbourne, VIC, Australia
²⁰ Healthy Brain and Mind Research Centre, Australian Catholic University, Melbourne, VIC, Australia
^* Corresponding author Email: andrew.gumley@glasgow.ac.uk

Declared competing interests of authors: Andrew I Gumley reports personal fees from the University of Manchester, the University of Exeter and the British Association for Behavioural & Cognitive Psychotherapies (BABCP) (Accrington, UK), and other interests with NHS Education for Scotland outside the submitted work. John Ainsworth reports other interests with Affigo CIC (Manchester, UK) outside the submitted work. Sandra Bucci is a director of Affigo CIC, a not-for-profit social enterprise company spun out of the University of Manchester in December 2015 to enable access to social enterprise funding and to promote ClinTouch, a symptom-monitoring app, to the NHS and public sector. Andrew Briggs reports personal fees from Bayer (Leverkusen, Germany), Merck Sharp & Dohme (Kenilworth, NJ, USA), Janssen Pharmaceutica (Beerse, Belgium), Novartis (Basel, Switzerland), SWORD Health (Porto, Portugal), Amgen Inc. (Thousand Oaks, CA, USA) and Daiichi Sankyo (Tokyo, Japan) outside the submitted work. John Farhall reports grants from the National Health and Medical Research Council (Australia) during the conduct of the study and other interests with Melbourne Health (NorthWestern Mental Health, Parkville, VIC, Australia) outside the submitted work. Shôn Lewis reports grants from the Medical Research Council, non-financial support from Affigo CIC and personal fees from XenZone plc (Manchester, UK) outside the submitted work. Cathy Mihalopoulos reports grants from National Health and Medical Research Council (Australia) during the conduct of the study. John Norrie reports grants from the University of Aberdeen and the University of Edinburgh during the conduct of the study and declares membership of the following NIHR boards: CPR Decision Making Committee (2016), HTA Commissioning Board (2010–16), HTA Commissioning Sub-Board (EOI) (2012–16), HTA Funding Boards Policy Group (2016), HTA General Board (2016–19), HTA Post-Board funding teleconference (2016–19), NIHR CTU Standing Advisory Committee (2017–present), NIHR HTA and EME Editorial Board (2014–19) and Pre-exposure Prophylaxis Impact Review Panel (2017–present). Paul French is a member of the HTA Mental Health Prioritisation Panel (2017–present). Chris Williams reports grants from NIHR during the conduct of the study (HTA 10/104/34 BEAT-IT: a randomised controlled trial comparing a behavioural activation treatment for depression in adults with learning disabilities with attention control; NIHR multicentre RCT of a group psychological intervention for postnatal depression in British mothers of South Asian Origin: RP-PG-0514-20012: Integrated therapist and online CBT for depression in primary care); other from Five Areas Ltd (Clydebank, UK) outside the submitted work; and that he has twice been president of the British Association for Behavioural & Cognitive Psychotherapies, the lead body for cognitive–bahavioural therapy in the UK. This body aims to advocate use of evidence-based delivery of cognitive–bahavioural therapy.