Nothing in this Act shall be construed as preventing a patient who requires treatment for mental disorder from being admitted to any hospital or registered establishment in pursuance of arrangements made in that behalf and without any application, order or direction rendering him liable to be detained under this Act, or from remaining in any hospital or registered establishment in pursuance of such arrangements after he has ceased to be so liable to be detained.
Subsections (3) and (4) below apply in the case of a patient aged 16 or 17 years who has capacity to consent to the making of such arrangements as are mentioned in subsection (1) above.
If the patient consents to the making of the arrangements, they may be made, carried out and determined on the basis of that consent even though there are one or more persons who have parental responsibility for him.
If the patient does not consent to the making of the arrangements, they may not be made, carried out or determined on the basis of the consent of a person who has parental responsibility for him.
In this section—