1. UK Health Security Agency , Bristol, UK
2. National Institute of Health Research (NIHR) Health Protection Research Unit (HPRU) on Behavioural Science and Evaluation at the University of Bristol , Bristol, UK
3. Department of Health and Social Care , UK
4. King’s College London , London, UK
5. NIHR HPRU on Emergency Preparedness and Response at King’s College London , London, UK