The authorised psychiatrist may revoke a security patient's leave of absence by notice in writing and require the security patient to return to the designated mental health service if the authorised psychiatrist is satisfied that—
(a) revocation of leave is necessary to prevent—
(i) serious deterioration in the security patient's mental or physical health; or
(ii) serious harm to the security patient or to another person; or
(b) the security patient has failed to comply with a condition to which the leave of absence is subject; or
(c) the purpose for the leave of absence no longer exists.