Out-of-hours work has been identified as a major concern for registrars, and as contributing to the steady decline both in the number of applicants to vocational training schemes and in those practising as principals on completion of their training. Until now, little has been known about registrars' views about their experience of working out of hours and how this might be improved. The present study describes general practitioner (GP) registrars' current patterns of out-of-hours working and their perceptions about training needs.