In July 1983 the Regional Medical Officer of the North East Thames Regional Health Authority (NETRHA) appeared on television to announce the closure of Claybury Hospital and much of Friern Hospital over a ten-year period.

When NETRHA announced its decision, the policy to be pursued was innovative because it involved psychiatric hospitals serving inner-city populations, and because there was apparently no intention to achieve its aim by decanting patients into other psychiatric hospitals, as had been done with the closures of St Wulstan's and Banstead Hospitals. Although the run-down of psychiatric hospitals had been occurring at a steady rate in the United States and in England and Wales since the early 1950s, there had been few attempts to evaluate the policy, and none had been in any sense comprehensive (this supplement, paper 7). Clinicians and research workers in the field of social psychiatry were well aware of the need for large-scale evaluative studies, since protagonists and opponents of the policy of deinstitutionalisation were locked in a polemical argument which was pursued with increasing stridency through lack of reliable information.