(1)The responsible medical officer may grant to any patient who is for the time being liable to be detained in a hospital under this Part of this Act leave to be absent from the hospital subject to such conditions (if any) as that officer considers necessary in the interests of the patient or for the protection of other persons.
(2)Leave of absence may be granted to a patient under this section either indefinitely or on specified occasions or for any specified period; and where leave is so granted for a specified period, that period may be extended by further leave granted in the absence of the patient.
(3)Where it appears to the responsible medical officer that it is necessary so to do in the interests of the patient or for the protection of other persons, he may, upon granting leave of absence under this section, direct that the patient remain in custody during his absence; and where leave of absence is so granted the patient may be kept in the custody of any officer on the staff of the hospital, or of any other person authorised in writing by the managers of the hospital.
(4)In any case where a patient is absent from a hospital in pursuance of leave of absence granted under this section, and it appears to the responsible medical officer that it is necessary so to do in the interests of the patient's health or safety or for the protection of other persons, that officer may, subject to subsection (5) of this section, by notice in writing given to the patient or to the person for the time being in charge of the patient, revoke the leave of absence and recall the patient to the hospital.
(5)A patient to whom leave of absence is granted under this section shall not be recalled under subsection (4) of this section after he has ceased to be liable to be detained under this Part of this Act; and without prejudice to any other provision of this Part of this Act any such patient shall cease to be so liable at the expiration of the period of six months beginning with the first day of his absence on leave unless either—
(a)he has returned to the hospital, or has been transferred to another hospital under the following provisions of this Act, before the expiration of that period; or
(b)he is absent without leave at the expiration of that period.