Ethical approval and consent to participate
All methods were carried out in accordance with relevant guidelines and regulations (e.g., the Declaration of Helsinki). This trial has received ethical approval by Ethics committee of Swansea University, 25/09/2019 Ref: 1521. Participants selected for the Prevail intervention programme undertook this programme as part of their work duties mandated by the DVLA. Sickness absence data from Human Resources at the DVLA were provided at a group level (active vs. control) with no individuating information included, and so individual consent was not required. Completion of the psychometric questionnaire data was voluntary, as participation in the attitudinal evaluation was not deemed part of employees’ work duties. Thus, written informed consent was taken from all staff for completion of the psychometric measures. Staff who did not wish to engage in the evaluation of Prevail were allowed to leave the information/evaluation sessions without the need to justify their decision. All data was anonymous and was analysed on a group basis. Any data relating to sub-groups (e.g. by DVLA division, age, and mental health status) that fell under a group number of 10 was withheld from the researchers in order to comply with the UK Data Protection Act (2018) and GDPR regulation via a detailed Data Protection Impact Assessment.