Recent ministerial statements and health circulars have identified a key role for the NHS in providing services for people with a learning disability who have a mental illness or a severe behaviour disorder (NHS Management Executive, 1992). This is not an insignificant task, given that psychiatric disorders (including both mental illness and/or severe behaviour disorders) occur among approximately 30% of people with a moderate or severe learning disability (Corbett, 1979; Lund, 1985). Patients with psychiatric disorders have proved particularly difficult to resettle from mental handicap hospitals, and form a substantial proportion of the patients who become long-stay residents of mental handicap hospitals despite the development of community-based services. It is therefore essential that each district health authority defines the most appropriate pattern of services for this group of patients, as part of their purchasing strategy for mental health. The type of service required was discussed by the department of Health report Needs and Responses: Services for Adults with Mental Handicap who are Mentally Ill, who have Behaviour Problems, or who Offend. This noted that no consistent pattern of services has yet emerged, and that suitable alternatives included admission to a specialised mental illness unit in a mental handicap hospital, admission to a general psychiatric ward, admission to a small staffed house, or treatment by a community support team.