(1) The validity of a decision made or an act done by the Commission (including by an authorised officer or adjudicator) in the performance of a function under Chapters 1 to 7 or Part 6 (whether such function is performed by way of powers conferred by or under this Act or otherwise) shall not be challenged other than -

(a) by way of an application for judicial review under Order 84 of the Rules of the Superior Courts (S.I. No. 15 of 1986) (in this section referred to as "Order 84"), and in accordance with this section, or

(b) in accordance with a process provided for in the Principal Act or this Act by which the validity of such decision or act may be challenged.

(2) Notwithstanding section 104, a person affected by, but not the subject of, a decision under section 90 or 91 may, not later than 14 days after the decision is published, apply to the Court by way of an application for judicial review under Order 84 and in accordance with this section.