In opposed applications, Rule 238(2a) of the High Court Rules 1971 requires the respondent's legal practitioner to file Heads of Argument within ten working days of receiving the applicant's/excipient's Heads, not within ten days of the matter being set down for hearing. The Union Metallurgical case applies to unopposed applications under Rule 223(1), not opposed applications under Rule 223(2). When considering condonation for late filing, courts must consider: (1) the degree of non-compliance; (2) the explanation for the delay; (3) prospects of success on the merits; (4) the respondent's interest in finality; (5) convenience of the court; and (6) avoidance of unnecessary delay in the administration of justice. A genuine misinterpretation of the law by legal practitioners, while regrettable, can constitute a reasonable explanation for delay where it is neither willful nor mala fide.