“(1) there must be a sufficiently real and imminent risk of a tort being committed to justify quia timet relief; (2) it is impossible to name the persons who are likely to commit the tort unless restrained; (3) it is possible to give effective notice of the injunction and for the method of such notice to be set out in the order; (4) the terms of the injunction must correspond to the threatened tort and not be so wide that they prohibit lawful conduct; (5) the terms of the injunction must be sufficiently clear and precise as to enable persons potentially affected to know what they must not do; and (6) the injunction should have clear geographical and temporal limits.”
“In the light of precedents which were not cited in the Ineos case but which have been drawn to our attention on the present appeal, I would enter a caveat in relation to the fourth of these requirements. While it is undoubtedly desirable that the terms of an injunction should correspond to the threatened tort and not be so wide that they prohibit lawful conduct, this cannot be regarded as an absolute rule. The decisions of the Court of Appeal in Hubbard v Pitt[1976] QB 142 and Burris v Azadani[1995] 1 WLR 1372 demonstrate that, although the court must be careful not to impose an injunction in wider terms than are necessary to do justice, the court is entitled to restrain conduct that is not in itself tortious or otherwise unlawful if it is satisfied that such a restriction is necessary in order to afford effective protection to the rights of the claimant in the particular case. In both those cases the injunction was granted against a named person or persons. What, if any, difference it makes in this regard that the injunction is sought against unknown persons is a question which does not need to be decided on the present appeal but which may, as I understand, arise on a pending appeal from the decision of Nicklin J in Canada Goose UK Retail Ltd v Persons Unknown[2019] EWHC 2459 (QB) ; and in these circumstances I express no opinion on the point.”
“12. … The application is made against “persons unknown”