1. The discretion under s 172(1)(b) of the Constitution to determine just and equitable remedies following a declaration of invalidity is broad, value-laden, and context-specific, requiring a balance between correcting constitutional invalidity, vindicating the rule of law, and avoiding unjust outcomes. 2. Appellate interference with the exercise of discretion under s 172(1)(b) is justified only where the discretion was not exercised judicially, was influenced by material misdirection on law or facts, or produced a result no reasonable court could reach. 3. No party should profit from unlawful conduct, and an invalid tender does not give rise to a right to benefit from an unlawful contract. 4. While an innocent tenderer acting in good faith may in appropriate circumstances retain some benefit, contractors who are active participants in irregular procurement processes (as opposed to passive recipients of unlawful state decisions) are not entitled to the normative benchmark of competitive commercial return. 5. The 'no profit, no loss' principle, while not a rigid rule excluding profit in all cases, appropriately applies where contractors are culpable participants in irregular procurement, even absent findings of fraud or corruption. 6. In reconsideration proceedings under s 17(2)(f) of the Superior Courts Act, reasonable prospects of success are necessary but insufficient; special circumstances must be shown.