An application for condonation of late filing requires a reasonable explanation for the delay. Where a legal practitioner's procedural error caused the delay, the legal practitioner should depose to the founding affidavit under Rule 227(4) to explain the circumstances. A purported appeal noted without first obtaining leave to appeal where leave is required is a nullity ab initio, and time for compliance with rules cannot be computed from the date such nullity was struck off. The absence of a reasonable explanation for delay is fatal to an application for condonation, regardless of other factors. Condonation is an indulgence granted in the court's discretion based on established criteria including extent of delay, reasonableness of explanation, prospects of success, prejudice, finality in litigation, and convenience of the court.