25 Even allowing for the possibility that Ms Douglas has overstated the extent of the disruption which would be caused to The Optical Superstore's business by an interlocutory injunction, it is obvious that the detrimental effects of such a restraint would be substantial. Moreover, the loss flowing to The Optical Superstore if an interlocutory injunction were granted and dissolved after trial would not all be readily measurable in money. Some of the expenses detailed by Ms Douglas could be measured in that way as could the value thrown away of promotional material rendered useless and the cost of developing new material to replace it. However, the effect of the suspension of The Optical Superstore's present advertising techniques on its volume of business and profit margins would be far from easy to quantify. For that reason, The Optical Superstore would be severely inconvenienced if it had to enforce the presumptive undertaking as to damages after an interlocutory injunction had been dissolved.
26 On the other hand, the detriment to Specsavers, if an interlocutory injunction be refused, will consist largely in the continued use by a significant competitor of an advertising technique which Specsavers believes to be misleading or deceptive. The loss occasioned to Specsavers by that presumptive contravention of the TPA would also be difficult, if not impossible, to quantify in pecuniary terms. That is because the loss would be borne distributively by Specsavers and a multitude of other optical retailers throughout Australia. Although these considerations as to the inadequacy of damages provide some weight to the claim for an interlocutory injunction, I do not consider that they balance the countervailing inconvenience which interlocutory relief would occasion to The Optical Superstore.
27 I do not regard this as a case in which the public interest militates in favour of interlocutory relief. Cases in which that element can be a factor were described in these terms by von Doussa J in Glev Pty Ltd v Kentucky Fried Chicken Pty Ltd [1994] FCA 79, (unreported, 17 February 1994);
'However, it must be remembered that these proceedings are brought under the umbrella of the Trade Practices Act which is an Act for the protection of consumers. There is an element of public interest involved. That being so, the Court will be slower to withhold relief than would be an equity court in a suit involving individual interests alone. The "unclean hands" argument is a matter to be taken into account, but it may not be a matter that would lead to the withholding of a remedy if the public interest appeared to require a remedy to protect consumers.'
28 In the present case, as I already noted, I regard as slight the risk of prospective purchasers of spectacles being misled by the subject advertisements. On the other hand, the advertisements identify The Optical Superstore as what is popularly called a "discount" supplier. There is no suggestion that the marked prices on its spectacle frames from which it deducts its discounts of 70% or 40% are substantially or regularly above the prices at which similar frames are offered for sale in the relevant retail market. There could therefore be a positive detriment to the public interest if prospective purchasers were deprived, during the period of an interlocutory injunction, of the information, presumably true, that The Optical Superstore's outlets are "discount stores".
29 In a similar context, I have been influenced to refuse interlocutory relief by the unanimity of the parties that they will co-operate in having this application listed for speedy trial and that such a trial should not be of long duration. I shall make a direction to give effect to that measure of agreement between the parties.
30 The advertisements which it is sought to restrain have been published more or less continuously since January 2009 and the evidence establishes that The Optical Superstore has utilised broadly similar forms of advertising since January 2007. This may be thought to afford some scope for application of the equitable doctrine of laches. Of that doctrine, Lord Blackburn in Erlanger v New Sombrero Phosphate Co (1878) 3 App Cas 1218 said, at 1279;
'And a Court of Equity requires that those who come to it to ask its active interposition to give them relief, should use due diligence, after there has been some notice or knowledge as to make it inequitable to lie by.'
31 On the present application, neither party has placed much reliance on the doctrine in its pure form. Mr Elliott SC, who appeared with Mr Heerey for The Optical Superstore, contented himself with referring to the relevant paragraph from Spry, Principles of Equitable Remedies (7th ed, 2007) at 434-435. Mr Jopling QC for Specsavers, noted that authorities such as Australian Competition and Consumer Commission v Universal Music Australia Pty Ltd (No 2) [2002] FCA 192 per Hill J, at [47], establish that equitable principles are not always given unrestricted application in litigation brought under the TPA.
32 Although on one view there has been a substantial delay by Specsavers in seeking an interlocutory injunction and that delay is so far unexplained, it is not a matter to which I have attached significant weight in evaluating the balance of convenience.