Dumrul v Standard Chartered Bank

Security for costs will not ordinarily be ordered against a claimant where the claim and a defendant's counterclaim raise substantially the same issues, so that the costs of defending the claim would be incurred anyway in prosecuting the counterclaim (the Crabtree principle), and a defendant who declines to give an unqualified undertaking not to pursue its counterclaim if the claim is stayed will generally fail to obtain security.