The binding legal principles established are: (1) Review proceedings under PAJA must be instituted without unreasonable delay even when challenging regulations (subordinate legislation), and the making of regulations by a statutory authority constitutes administrative action subject to PAJA; (2) The 180-day period in section 7(1) of PAJA begins to run from the date a person becomes aware of the administrative action and reasons for it, and does not restart or pause when a party requests additional or further reasons after having already received reasons; (3) Section 5(1) of PAJA only applies where a person has not been given reasons for administrative action, and cannot be used to request reasons for why particular submissions were not adopted in regulations; (4) A regulator has no duty to accept or adopt all submissions made during a public consultation process when making regulations, provided it genuinely considers all submissions received; (5) Factors relevant to exercising discretion to refuse condonation for unreasonable delay include: length of delay, reasonableness of explanation, prejudice to parties who arranged affairs in reliance on the decision, public interest in finality of administrative decisions, and prospects of success; (6) Proof of actual prejudice is not a precondition for refusing review proceedings by reason of undue delay, though extent of prejudice shown is a relevant consideration; (7) A new constitutional challenge to legislation or subordinate legislation cannot be raised for the first time on appeal where: (a) it deprives the respondent of the opportunity to justify limitation of fundamental rights under section 36 of the Constitution; (b) interested parties have not been given rule 16A notification; (c) necessary parties have not been joined; and (d) it would be unfair and prejudicial to the respondent; (8) In matters concerning constitutional validity of subordinate legislation, a pragmatic approach should be adopted in identifying necessary parties to be joined - at minimum, those with an immediate legal interest who are easily identifiable (such as licensees bound by regulations) should be joined.