is defined as "any disorder or disability of mind". The concept of mental disorder as defined by the Act does not necessarily correspond to medical categories of mental disorder such as those outlined in ICD-10 or DSM-IV. However, mental disorder is thought by most psychiatrists to cover schizophrenia, anorexia nervosa, major depression, bipolar disorder and other similar illnesses, learning disability and personality disorders. Professionals and persons involved Subjects Most people are subject to the Act, and section 141 even makes provision for members of the House of Commons, until it was repealed by the Mental Health (Discrimination) Act 2013. In 1983–84, the House of Lords Committee for Privileges accepted the advice of the law lords that the statute would prevail against any privilege of Parliament or of peerage. Approved Mental Health Professionals An Approved Mental Health Professional (AMHP) is defined in the Act as a practitioner who has extensive knowledge and experience of working with people with mental disorders. Until the 2007 amendments, this role was restricted to social workers, but other professionals such as nurses, clinical psychologists and occupational therapists are now permitted to perform this role. AMHPs receive specialised training in mental disorder and the application of mental health law, particularly the Mental Health Act. Training involves both academic work and apprenticeship and lasts one year. The AMHP has a key role in the organisation and application of Mental Health Act assessments and provides a valuable non-medical perspective in ensuring legal process and accountability. (For further aspects on the role of the AMHP see also: Involuntary commitment in the United Kingdom.) Section 12 approved doctors A section 12 approved doctor is a medically qualified doctor who has been recognised under section 12(2) of the Act. They have specific expertise in mental disorder and have additionally received training in the application of the Act. They are usually psychiatrists, although some are general practitioners (GPs) who have a special interest in psychiatry. Approved Clinicians and Responsible Clinicians An Approved Clinician (AC) is a healthcare professional who is competent to become responsible for the treatment of mentally disordered people compulsorily detained under the Act. A clinician must complete special training and demonstrate competence in their professional portfolio in order to be approved as an AC. Until the 2007 amendments, they would almost exclusively have been a consultant psychiatrist, but other professionals, such as social workers, clinical psychologists and nurse specialists, are