22   Power to obtain documents etc

(1)  For the purposes of an investigation, the Commission may, by notice in writing served on a person (whether or not a public authority or public official), require the person:

(a)  to attend, at a time and place specified in the notice, before a person (being the Commissioner, an Assistant Commissioner or any other officer of the Commission) specified in the notice, and

(b)  to produce at that time and place to the person so specified a document or other thing specified in the notice.

(2)  The notice may provide that the requirement may be satisfied by some other person acting on behalf of the person on whom it was imposed and may, but need not, specify the person or class of persons who may so act.