Mental Health Act 1959
Act of the Parliament of the United Kingdom
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Through Mental disorder
The Mental Health (Scotland) Act 1960 (8 & 9 Eliz. 2. c. 61) made similar provisions for Scotland.
It also defined the term mental disorder for the first time, making mental illness distinct from learning disabilities. The definition reads: “mental illness; arrest or incomplete development of mind; psychopathic disorder; and any other disorder or disability of mind”.
At the time, 0.4% of the population of England were housed in asylums, receiving the standard treatments of the time. Their treatment was considered by the 1957 Percy Commission and the act resulted from its deliberations. The act was designed to make:
- treatment voluntary and informal;
- and where compulsory give it a proper legal framework and made as a medical decision;
- and to move treatment, where possible, away from institutional care to that in the community.
The act repealed the Lunacy and Mental Treatment Acts 1890 to 1930 and the Mental Deficiency Acts 1913 to 1938.
One of the changes introduced by the act was the abolishment of the category of "moral imbecile". The category, which had been introduced in the 1913 act, had been defined in such vague terms that it had allowed mothers of illegitimate children, especially in case of repeated births out of wedlock, to be regarded as "moral imbeciles" and thus to be placed in an institution for defectives or to be placed under guardianship.
Provisions
Repealed enactments
Section 149(2) of the act repealed 72 enactments, listed in the eighth schedule to the act.
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Subsequent developments
Section 149(2) of, and schedule 8 to, the act were repealed by section 1 of, and part XI of the schedule to, the Statute Law (Repeals) Act 1974, which came into force on 27 June 1974.
Most of the act was repealed by section 148(3) of, and schedule 6 to, the Mental Health Act 1983, which came into force on 30 September 1983.

