A person who suffers or has suffered from mental illness, subnormality, severe subnormality or psychopathic disorder and on account of that condition either—
is resident in a hospital or other similar institution ; or
regularly attends for treatment by a medical practitioner.
A person who, under Part VIII of the [1959 c. 72.] Mental Health Act 1959, has been determined by a judge to be incapable, by reason of mental disorder, of managing and administering his property and affairs.
A person for the time being in guardianship under section 33 of the Mental Health Act 1959.