This report presents the findings of a survey of psychiatric morbidity among adults aged 16 to 74 living in private households in Great Britain. The survey was carried out between March and September 2000. It was commissioned by the Department of Health, the Scottish Executive and the National Assembly for Wales. It is one of a series of surveys of different population groups which began in 1993 and is a repeat of the first of these surveys which covered adults aged 16 to 64 living in private households. The report describes the prevalence of a range of mental disorders, including personality disorder, in the general household population. It also considers the extent to which the prevalence of some of these disorders has changed since the earlier survey in 1993. It describes how people with particular disorders differ for those without any disorder on a range of factors: their background and personal characteristics, including employment and accommodation, physical health, current treatment and service use. The report includes a description of the survey methods use and aims to provide an overview of the main topics covered.