Recruitment procedure
We used a convenience sampling method. During trial follow‐up, we asked participants if they would like to take part in an interview about their experience in the study. Participants who had withdrawn from the study or did not complete follow‐ups were not approached for an interview. Informed consent was obtained verbally and recorded at the start of the interview; there was no written consent. The information sheet for the qualitative interviews was combined with the main trial information sheet.To ensure confidentiality, with informed consent from participants, interviews were recorded using an encrypted digital voice recorder, transcribed and anonymized. Any identifying information in the transcripts was removed, but considering the risk of reidentification, researchers involved in the study were bound to confidentiality regulations set by the University of Bath and NHS. To further protect confidentiality, access to anonymized transcript data is restricted to only approved bona fide researchers after application to the University of Bath's Research Data Archive.