Behavioural nudges to increase responses from residents in England to a postal invitation from NHS England to take part in the Antiplatelet Secondary Prevention International Randomised study after INtracerebral haemorrhaGe (ASPIRING)

The primary objective is to determine the effects on responses to a nudge in letters of invitation to take part in the ASPIRING study. The secondary objective is to determine whether the effects differ between sub-groups of people who are often underrepresented in randomised trials.