5. Sections 19, 20, 21 and 22 of the Principal Act are repealed and the following section substituted:
“22. (1) Subject to this section, the Minister may, in writing, appoint a person to act as Director—
(a) during a vacancy in the office of Director, whether or not an appointment has previously been made to the office; or
(b) during any period, or during all periods, when the Director is for any reason unable to perform the functions of the office;
on such terms and conditions as are determined by the Minister in writing.
“(2) A person appointed to act as the Director during a vacancy in the office of Director shall not so act continuously for more than 12 months.
“(3) A determination under subsection (1) shall not include a term or condition that could not be applicable to an Executive employed under section 72 of the Public Sector Management Act 1994 .
“(4) Anything done by or in relation to a person purporting to act pursuant to an appointment under subsection (1) is not invalid on the ground that—
(a) the appointment was ineffective or had ceased to have effect; or
(b) the occasion to act had not arisen or had ceased.”.