This paper explores mental health nurse educators' perceptions of the involvement of service users in preregistration nurse education. The idea for the study was developed from a local group of people including service users, lecturers and students committed to finding ways to develop service user involvement in education. This qualitative study uses semi-structured interviews to explore participants' perceptions in depth. Five lecturers who teach on the diploma programme based at a large teaching hospital were interviewed. The results suggest that the current situation of involving service users at the research site was ineffective. The concepts of 'role' and power relationships were used to explore the reasons for this. The development of service user involvement in education is complex and requires further research.