"The court must carry out a balancing exercise. On the one hand it must weigh the injustice to the plaintiff if prevented from pursuing a proper claim by an order for security. Against that, it must weigh the injustice to the defendant if no security is ordered and at the trial the plaintiff’s claim fails and the defendant finds himself unable to recover from the plaintiff the costs which have been incurred by him in his defence of the claim. The court will probably be concerned not to allow the power to order security to be used as an instrument of oppression, such as by stifling a genuine claim by an indigent company against a more prosperous company, particularly when the failure to meet that claim might in itself have been a material cause of a plaintiff's impecuniosity..."
“There is a clear difference between incurring a substantial risk, in the overall interests of justice, that a claimant will not be able to raise the sum required as security, and setting a sum in the knowledge that he cannot do so. The latter is tantamount to striking out his claim and requires the same process and justification as any other strike-out. The former is the striking, within the Convention paradigm, of a balance of the kind described in the two judgments we have mentioned.”