The binding legal principles established are: (1) Exceptional circumstances under s 17(2)(f) of the Superior Courts Act are jurisdictional facts that must be established before the court can exercise reconsideration powers; (2) Exceptional circumstances must involve more than satisfying requirements for special leave to appeal and must be linked to either probability of grave individual injustice or situations where administration of justice might be brought into disrepute; (3) The existence of exceptional circumstances is not a matter of judicial discretion but a factual determination the court must make; (4) Section 17(2)(f) is a proviso or exception to the rule of finality and must be construed strictly; (5) Procedural irregularities, including failure to record proceedings or provide written reasons for refusing leave to appeal, do not constitute exceptional circumstances absent demonstration of grave injustice or prejudice; (6) In computing time periods in court orders, 'court days' means days that are not public holidays, Saturdays or Sundays, as defined in Rule 1 of the Uniform Rules of Court, and only court days are included in the computation of time expressed in days.