Funding for this research was provided by:
National Institute for Health Research (NIHR) Applied Research Collaboration South West Peninsula
Public Health Research Programme (12/153/60, 12/153/60, 12/153/60)
Education Endowment Foundation
Received: 2 June 2021
Accepted: 17 January 2022
First Online: 27 February 2022
: Ethics approval for the original study was provided by the University College London ethics committee (ref 5248/001). This study was performed in accordance with relevant guidelines and regulations (i.e. Declaration of Helsinki). Written, informed consent was obtained from head teachers for random allocation and intervention, and from individual students, staff, and intervention facilitators for data collection.
: Not applicable.
: The authors have no competing interests to declare.