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Barry Wright, Ellen Kingsley, Cindy Cooper, Katie Biggs, Matthew Bursnall, Han-I Wang, Tim Chater, Elizabeth Coates, M Dawn Teare, Kirsty McKendrick, Gina Gomez de la Cuesta, Amy Barr, Kiera Solaiman, Anna Packham, David Marshall, Danielle Varley, Roshanak Nekooi, Steve Parrott, Shehzad Ali, Simon Gilbody & Ann Le Couteur.

Barry Wright ^1,2,*, Ellen Kingsley ², Cindy Cooper ³, Katie Biggs ³, Matthew Bursnall ³, Han-I Wang ¹, Tim Chater ³, Elizabeth Coates ³, M Dawn Teare ⁴, Kirsty McKendrick ³, Gina Gomez de la Cuesta ⁵, Amy Barr ³, Kiera Solaiman ³, Anna Packham ³, David Marshall ¹, Danielle Varley ¹, Roshanak Nekooi ², Steve Parrott ¹, Shehzad Ali ¹, Simon Gilbody ¹, Ann Le Couteur ⁴

¹ Hull York Medical School, University of York, York, UK
² Child Oriented Mental Health Innovation Collaborative, Leeds and York Partnership NHS Foundation Trust, York, UK
³ Clinical Trials Research Unit, School of Health and Related Research (ScHARR), University of Sheffield, Sheffield, UK
⁴ Population Health Sciences Institute, Newcastle University, Newcastle upon Tyne, UK
⁵ Play Included CIC, Duxford, UK
^* Corresponding author Email: barry.wright1@nhs.net

Disclosure of interests

Full disclosure of interests: Completed ICMJE forms for all authors, including all related interests, are available in the toolkit on the NIHR Journals Library report publication page at https://doi.org/10.3310/VGTR7431.

Primary conflicts of interest: Gina Gomez de la Cuesta co-authored the LEGO® (LEGO System A/S, Billund, Denmark) based therapy manual that formed the basis of the intervention delivered in the trial with the permission of all co-authors. Gina Gomez de la Cuesta worked as a sole trader training professionals in LEGO® based therapy from 2015 to 2018. In 2018, Gina Gomez de la Cuesta founded Bricks for Autism CIC (now Play Included CIC), a community interest company, to continue to offer training in LEGO® based therapy, and has received a salary as an employee of the company. On 30 March 2021, the LEGO Foundation (Billund, Denmark) and Play Included CIC officially launched a partnership to scale training, awareness, accessibility and research into the Brick-by-Brick programme internationally. With the agreement of the LEGO Foundation, the term ‘LEGO® based therapy’ is used in this report, and any related papers or presentations, but in future research and unconnected publications the term ‘Play Brick Therapy’ will be used instead. Cindy Cooper is a member of the National Institute for Health and Care Research (NIHR) Clinical Trials Unit (CTU) Standing Advisory Committee (2016–present) and the UK Clinical Research Collaboration Registered Clinical Trials Units Network Executive Group (2015–present). Simon Gilbody reports membership of the NIHR Health Technology Assessment (HTA) Efficient Study Designs (2017–20), the NIHR HTA Funding Committee Policy Group (formerly Clinical Studies Group) (2017–20), NIHR HTA Clinical Evaluation and Trials Committee (2008–14) and NIHR HTA Commissioning Committee (2016–20).