1. Decisions of the Supreme Court on non-constitutional matters, while final under s 169 of the Constitution, are subject to review by the Constitutional Court where they violate fundamental rights. 2. Section 28(4) of the Competition Act requires the Competition and Tariff Commission to observe natural justice principles and give affected persons an adequate opportunity to make representations during investigations. 3. An adequate opportunity to make representations requires disclosure of the essential factual and legal basis for proposed adverse decisions; parties cannot be expected to respond meaningfully without knowing the case against them. 4. Where an administrative decision-maker fails to provide a fair hearing, all subsequent proceedings based on that decision are irregular and should be set aside. 5. The audi alteram partem principle requires that affected persons be "put in possession of such information as will render [their] right to make representations a real, and not an illusory one." 6. Under s 40 of the Competition Act, the Administrative Court's jurisdiction on appeal is limited to confirming, varying, reversing, setting aside or remitting decisions; it does not have power to rehear competition matters afresh unless specifically authorized by statute. 7. Where there are disputes of fact that cannot be resolved on the papers, and no evidence has been led, courts cannot make definitive findings on those disputed issues.