The binding legal principles established are: (1) Section 217 constitutional procurement requirements are not merely internal prescripts that may be disregarded at whim - they are legally required constitutional imperatives; (2) In legality reviews (unlike PAJA reviews), while proceedings must be brought without unreasonable delay, there is no fixed time limit and courts have broader discretion to condone delay; (3) Whether delay is unreasonable is a factual inquiry; whether unreasonable delay should be condoned involves a value judgment considering all circumstances; (4) Relevant factors for condoning delay in legality reviews include: nature and extent of illegality, interests of justice, prospects of success, prejudice, explanation for delay, public interest in finality versus clean governance; (5) Tender requirements serve the constitutional purposes of fairness, equality of treatment, transparency, competitiveness and cost-effectiveness - material deviations from these requirements that cannot be shown to substantially achieve the purposes they serve render procurement decisions unlawful; (6) Where bid evaluation committees deviate from mandatory tender requirements without lawful basis, particularly by treating bidders unequally or waiving requirements for some but not others, the resultant award is constitutionally invalid; (7) Post-award fundamental variations to tender terms that alter the competitive basis of procurement (such as shifting financial responsibility from tenderer to procuring entity) constitute material illegality warranting setting aside; (8) When conduct is found inconsistent with the Constitution, courts must declare it invalid under section 172(1)(a) - this is mandatory, not discretionary; (9) The more egregious the breach of procurement prescripts and the greater the financial implications, the more courts should incline toward condoning delay to enable substantive review of legality.