Funding for this research was provided by:
Guy's and St Thomas' Charity
Received: 6 May 2020
Accepted: 5 July 2021
First Online: 19 July 2021
: This study received ethical approval from the Queen Mary Ethics of Research Committee on 23 May 2018 [QMERC2018/35]. Written informed consent was obtained from all individual participants included in this study.
: All authors report receiving a grant from the Guy’s and St Thomas’ Charity that funded the research reported in this paper. KF, RP and CS were members of staff of Southwark Council at the time of the incident and during the evaluation. SJ, AM, MC and JK declare that they have no other competing interests that could appear to have influenced the submitted work.