Data availability
Anonymised data may be made available by request to corresponding author. The study protocol has been published and a link to statistical analysis plan is included in the paper. CONSORT 2010 guidelines were followed in the reporting of this trial. Several authors had full access to all the data in the study and had final responsibility for the decision to submit for publication.Changes from the original funding proposal include, following pilot work, a funded extension for a full trial (rather than an external pilot trial as originally funded), which is described in the published protocol, trial registry and statistical analysis plan. The discrepancies from the published protocol included provision of top-up training for existing practitioners during the trial and changes made in response to COVID-19, including online delivery and remote data collection. The study protocol and statistical analysis plan have been published.