An order requiring payment of a specified sum 'on account of' costs as a condition of proceeding with an application is subject to three constraints: (1) it is unnecessary where costs are already payable forthwith; (2) the quantum must be supported by proper evidence, not merely counsel's relay of a solicitor's figure; and (3) where the order operates as de facto security for costs against a party who is in substance a defendant, the factors relevant to security for costs must be considered, including whether the order would stultify the defence. Dismissal of an application to set aside default judgment solely for non-payment of such a sum, without any consideration of the merits, is an error of principle.
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