A significant amount of valuable undergraduate medical teaching may be informal, unscheduled and delivered by non-consultant hospital doctors (NCHDs). 800 Questionnaires were distributed to consultants, NCHDs and medical students in Irish teaching hospitals. The aim was to quantify the level of unscheduled teaching carried out in these hospitals and the manner in which it was performed. The response rate was 46% (364/800). 71% of doctors who replied are independently teaching undergraduate medical students (77/109), including 71% of interns and senior house officers (48/68). Students tend to prefer small group teaching. Fifty-six percent of students suggest they would benefit from more surgical teaching time (144/255). No interns surveyed were scheduled to teach as part of a formal curriculum. A significant amount of unscheduled teaching by interns and senior house officers takes place in Irish hospitals. It may prove beneficial to incorporate interns into scheduled surgical teaching curricula.