"A person who is not a party but who is directly affected by a judgment or order may apply to have the judgment or order set aside or varied."
"29 The court has an undoubted jurisdiction to grant injunctive relief on a quia timet basis when that is necessary in order to prevent a threatened or apprehended act of nuisance. But because this kind of relief ordinarily involves an interference with the rights and property of the defendant and may (as in this case) take a mandatory form requiring positive action and expenditure, the practice of the court has necessarily been to proceed with caution and to require to be satisfied that the risk of actual damage occurring is both imminent and real. That is particularly so when, as in this case, the injunction sought is a permanent injunction at trial rather than an interlocutory order granted on American Cyanamid principles having regard to the balance of convenience. A permanent injunction can only be granted if the claimant has proved at the trial that there will be an actual infringement of his rights unless the injunction is granted. 30 A much-quoted formulation of this principle is set out in the judgment of Pearson J in Fletcher v. Bealey(1884) 28 Ch D 688 at 698 where he first quotes from Mellish LJ in Salvin v. North Brancepeth Coal Company (1874) LR 9 Ch App 705 and then adds his own comments that: "…it is not correct to say, as a strict proposition of law, that, if the plaintiff has not sustained, or cannot prove that he has sustained, substantial damage, this Court will give no relief; because, of course, if it could be proved that the plaintiff was certainly about to sustain very substantial damage by what the defendant was doing, and there was no doubt about it, this Court would at once stop the defendant, and would not wait until the substantial damage had been sustained. But in nuisance of this particular kind, it is known by experience that unless substantial damage has actually been sustained, it is impossible to be certain that substantial damage ever will be sustained, and, therefore, with reference to this particular description of nuisance, it becomes practically correct to lay down the principle, that, unless substantial damage is proved to have been sustained, this Court will not interfere. I do not think, therefore, that I shall be very far wrong if I lay it down that there are at least two necessary ingredients for a quia timet action. There must, if no actual damage is proved, be proof of imminent danger, and there must also be proof that the apprehended damage will, if it comes, be very substantial. I should almost say it must be proved that it will be irreparable, because, if the danger is not proved to be so imminent that no one can doubt that, if the remedy is delayed, the damage will be suffered, I think it must be shewn that, if the damage does occur at any time, it will come in such a way and under such circumstances that it will be impossible for the Plaintiff to protect himself against it if relief is denied to him in a quia timet action." 31 More recently in Lloyd v. Symonds[1998] EWCA Civ 511 (a case involving nuisance caused by noise) Chadwick LJ said that: "
"Those Defendants who are not already in occupation of [the Site] [20] must not enter or remain on Site without the written consent of [Vastint]…"
"Persons entering or remaining without the consent of the claimants, or any of them, on any of the incinerator sites at [the addresses were then set out] in connection with the "