Wilful default occurs only when a party, with full knowledge of the service or set down of the matter and of the risks attendant upon default, freely and deliberately takes a decision to refrain from appearing. Failure to attend court due to a mistake or lack of knowledge of the correct hearing date does not constitute wilful default. The term 'wilful default' must be given its ordinary grammatical meaning: it requires that the person knows what he is doing, intends to do what he is doing, and is a free agent acting spontaneously. Where a party has demonstrated an intention to defend (such as by applying for a postponement) and fails to attend due to being unaware of the actual postponed date (especially where the court postponed to a different date than requested), there is no wilful default. A credible explanation for non-attendance, especially where it would be improbable that the party would intentionally abstain from defending, negates wilful default.