Frequency and plans for auditing trial conduct {23}
As noted above, during the trial period, each blood donation team within NHSBT has been audited at least once during each intervention period (i.e. every 9 months). During these visits, NHSBT staff members recorded what interventions were in place at the team they visit along with any other relevant observations. The study group then reviewed these findings and identified any potential discrepancies. If any discrepancies appeared, the site has been asked to amend their practices in line with the study protocol.