Potentially eligible participants do not always agree to take part in trials when approached, which makes recruitment more challenging, time-consuming, and costly.  We conducted a Study Within a Trial (SWAT) to evaluate the effectiveness of showing people brief video testimonies about taking part in research in increasing their interest in participating.   This dataset includes information on what condition people were randomised to in the SWAT, and whether they expressed interest in the trial, whether they were screened, found to be eligible, and whether they ended up being randomised into the trial.