The binding legal principles established are: (1) An application for condonation in the Constitutional Court must be decided on the basis of whether it is in the interests of justice, considering all relevant factors including the nature of relief sought, extent and cause of delay, nature and cause of any defect, effect on administration of justice, prejudice, and reasonableness of the applicant's explanation; (2) The Constitution does not apply retrospectively to transactions concluded before the interim Constitution came into effect, unless there are extraordinary circumstances where enforcement of previously acquired rights would be grossly unjust and abhorrent (following Du Plessis v De Klerk); (3) Section 34 of the Constitution (right of access to courts) cannot be invoked to challenge the validity of a sale in execution that took place before the Constitution came into operation; (4) Even where a court has the power to develop the common law retrospectively, it will not do so where it is not in the interests of justice, particularly where allowing the applicant to proceed would result in litigation continuing many years after it was last before a court and where the applicant has been dilatory in pursuing remedies.