91 The plaintiffs submitted that the injunction should be extended in a case such as this where the entitlement to ultimate relief is uncertain and where the consequences of not continuing injunctive relief will be grave for he plaintiffs. Mr King urged upon the Court the classic passage of McLelland J in Kolback Securities Limited v Epoch Mining N L (1987) 8 NSWLR 533 describing the approach that the Court should take in considering the grant of extension of an interlocutory injunction:
"As I see it, the position is as follows. Where a plaintiff's entitlement to ultimate relief is uncertain, the Court, in deciding to grant or refuse an interlocutory injunction, must consider what course is best calculated to achieve justice between the parties in the circumstances of the particular case, pending the resolution of the uncertainty, bearing in mind the consequences to the defendant of the grant of an injunction in support of relief to which the plaintiff may ultimately be held not to be entitled, and the consequences to the plaintiff of the refusal of an injunction in support of relief to which the plaintiff may ultimately be held to be entitled: see, eg, Appleton Papers Inc v Tomasetti Paper Pty Ltd [1983] 3 NSWLR 208 at 216; A v Hayden (No 1) (1984) 59 ALJR 1 at 4-5; 56 ALR 73 at 79. Where the uncertainty depends in whole or in part on a contested question of fact it is not appropriate for the Court to decide that question on the interlocutory application. Where the
uncertainty depends in whole or in part on a contested question of law, it may or may not be appropriate for the Court to decide that question on the interlocutory application, depending on circumstances, eg, whether the question is novel or difficult, or is susceptible of resolution on the present state of the evidence, or whether the urgency of the matter renders it impracticable to give proper consideration to the question: see, eg, A vHayden (No 1) (at 4; 78); Cohen v Peko-Wallsend (1986) 61 ALJR 57 at 59; 68 ALR 394 at 397. If the Court does decide the question of law the uncertainty is to that extent removed.
Unless the plaintiff shows that there is at least a serious question to be tried which if resolved in its favour would entitle it to final relief, then the requirements of justice as between the parties will dictate that an interlocutory injunction should be refused: Australian Coarse Grain Pool Pty Ltd v Barley Marketing Board of Queensland (1982) 57 ALJR 425; 46 ALR 398; Tableland Peanuts Pty Ltd v Peanut Marketing Board (1984) 58 ALJR 283; 52 ALR 651; A v Hayden (No 1) ; Castlemaine-Tooheys Ltd v South Australia (1986) 60 ALJR 679; 67 ALR 553 and Cohen v Peko-Wallsend Ltd .
Apart from this, although normally the Court "does not undertake a preliminary trial, and give or withhold interlocutory relief upon a forecast as to the ultimate result of the case" ( Beecham Group Ltd v Bristol Laboratories Pty Ltd (1968) 118 CLR 618 at 622), there are some kinds of case in which for the purpose of seeing where lies the balance of convenience (or more specifically" the balance of the risk of doing an injustice" - see per May LJ in Cayne v Global Natural Resources plc [1984] 1 All ER 225 at 237, cf per Brennan J in Brayson Motors Pty Ltd v Federal Commissioner of Taxation (1983) 57 ALJR 288 at 292; 46 ALR 279 at 285), it is desirable for the Court
to evaluate the strength of the plaintiff's case for final relief: see, eg, Brayson Motors Pty Ltd v Federal Commissioner of Taxation (at 292; 285); Castlemaine-Tooheys Ltd v South Australia at 682; 559. One class of case to which this applies is where the decision to grant or refuse an interlocutory injunction will in a practical sense determine the substance of the matter in issue: see, eg, NWL Ltd v Woods [1979] 1 WLR 1294 at 1306-1307; [1979] 3 All ER 614 at 625-626 per Lord Diplock; Cayne v Global Natural Resources plc . The present is such a case. The substantial matter in issue is whether
Epoch should be permitted to proceed with the issue of non-renounceable rights in accordance with the announcement of 13 March 1987. That will be irrevocably determined in a practical sense by the grant or refusal of an interlocutory injunction."
92 Mr King drew upon this passage and submitted that the present case is one where the grant or refusal of interlocutory injunctive relief will destroy the plaintiffs' business. He emphasised that there are contested matters of fact in issue that should be decided at a trial and that there are contested questions of law that cannot be resolved on the current state of the evidence. He submitted that the balance of convenience in the circumstances is that the injunction be continued.
93 The discharge of the injunction for non disclosure reveals the difficulty with the plaintiffs' submission. If the ex parte injunction should be discharged by reason of the plaintiffs' non disclosure, then that occurs in order to remove the effect of the non-disclosure. That result will follow even if it means there is consequential prejudice to the plaintiffs. The misuse of the Court's processes by deliberate non-disclosure requires the injunction to be dissolved in the interests of justice. If the threatened publications occur the plaintiffs are not without any remedy as they have an action for damages which they would still be at liberty to pursue.