Interpretation Act 1978

If an Act authorises or requires a person or authority (the

appointer) to appoint a person to an office or position, the appointer may appoint a person, or 2 or more people, to act in the office or position:

during a vacancy, or all vacancies, in the office or position whether or not an appointment has previously been made to the office or position; or

during any period, or all periods, when the holder of the office or position is unable to perform the duties of the office or position.