The inherent jurisdiction to order security for costs against a natural person is not confined to 'exceptional circumstances' or specified categories. The discretion involves a single inquiry into what the interests of justice require, and the sustained failure to articulate a viable claim is a legitimate factor justifying an order for security. There is no precondition or 'additional factor' that must be satisfied before the discretion is enlivened; impecuniosity alone is usually insufficient, but this is a practice rather than a jurisdictional limitation.
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