“16 International comity dictates a need for judicial deference in the international context, and an injunction to restrain foreign proceedings is only to be granted in exceptional cases. It is contrary to principle for an injunction to be granted solely on the ground that it is sought to restrain the relitigation elsewhere of a matter which has already been decided in England. It is a matter for the courts of the relevant country to decide what the effect of the English judgment on liability should be” the court went onto find (at [26]): “26 For reasons on which I will expand, in my judgment the English court has power over persons properly subject to its in personam jurisdiction to make ancillary orders in protection of its jurisdiction and its processes, including the integrity of its judgments. That power is of course a discretionary one, to be exercised in accordance with the requirements of international comity.”
“I do not accept the judgment debtors’ argument that there is a principle (whether it is expressed as a condition for the exercise of the jurisdiction, or as an aspect of comity, or as an element in the exercise of the discretion) that the English court will not restrain relitigation abroad of a claim which has already been the subject of an English judgment adverse to the person seeking to relitigate abroad. It has been established since at least 1837 that the fact that the respondent is seeking to relitigate in a foreign jurisdiction matters which are already res judicata between himself and the applicant by reason of an English judgment can be a sufficient ground for the grant of an anti-suit injunction.”
“But the present case is not a case where the foreign court has given a judgment with which an English injunction will be inconsistent. It is simply a case in which the judgment debtors are seeking to relitigate abroad the merits of a case which, after a long trial, they have lost in England. In my judgment it is a classic case of vexation and oppression, and of conduct which is designed to interfere with the process of the English court in litigation to which the judgment debtors submitted.”