What happened
On the night of 10 February 1964 a collision occurred between H.M.A.S. Voyager and H.M.A.S. Melbourne on the high seas near Jervis Bay. The respondent, a leading electrical mechanic serving on Voyager, was one of many crew members injured. For some years after the collision, legal opinion, influenced by the obiter remarks of Windeyer J. in Parker v. The Commonwealth (1965) 112 C.L.R. 295 at 301-302, suggested that public policy prevented a member of the armed forces from recovering damages for negligence of another member in the course of duty. That view was disapproved in Groves v. The Commonwealth (1982) 150 C.L.R. 113 at 118-119, 133-134, 136 and 137, which expanded the availability of negligence claims in a military context.
The respondent did not issue his writ until 2 November 1984, after the three-year period fixed by s.5(6) of the Limitation of Actions Act 1958 (Vict.) had expired. The Commonwealth's initial defence, delivered on 14 March 1985, admitted the allegations of negligence but did not admit injury, loss or damage. It did not plead the limitation defence or any defence based on Groves. Correspondence with solicitors acting for other survivors, including a letter of 21 November 1983 concerning Mr Robert Palmer, had indicated that the Commonwealth would not rely on the Act. On 6 September 1984 the respondent's solicitors wrote to the Secretary of the Department of Defence requesting that the statute be waived in his case and those of four others. On 25 January 1985 the Australian Government Solicitor confirmed that liability would be admitted and the limitation defence waived. That assurance was repeated in writing. The Australian Government Solicitor joined in several applications for an expedited hearing of damages on the basis that liability was not in issue. Ministerial statements, including a letter of 27 November 1985 to the respondent himself, reiterated that negligence was admitted and the limitation period was not being pressed.
In or around November 1985 the Commonwealth reconsidered its policy. It sought and obtained leave on 29 May 1986 to amend its defence to deny negligence, to plead that no duty of care was owed because the vessels were engaged in combat exercises, and to rely on the Limitation of Actions Act. The respondent's reply of 5 June 1986 asserted that neither defence was available and, in the alternative, that the Commonwealth had waived both defences or was estopped from relying on them. O'Bryan J. heard the preliminary questions of law on the basis that the relevant facts were not in dispute. He held that the public-policy defence based on Groves was not available on the facts but that the limitation defence could be raised because any waiver was revocable and no estoppel arose. Judgment was entered for the Commonwealth.
The Full Court of the Supreme Court of Victoria allowed the respondent's appeal by majority (Kaye and Marks JJ., King J. dissenting). The court unanimously rejected the waiver argument but the majority held that the Commonwealth was estopped from resiling from its promise not to plead the statute. King J. would have limited relief to out-of-pocket costs thrown away by the change of position. The Commonwealth's cross-appeal on the Groves point was dismissed. The proceedings were remitted for trial. The Commonwealth appealed to the High Court.
The High Court (Mason C.J., Brennan, Deane, Dawson, Toohey, Gaudron and McHugh JJ.) dismissed the appeal. Mason C.J. and Brennan and McHugh JJ. would have allowed it, holding that the detriment suffered by the respondent was adequately met by an order for costs and that holding the Commonwealth to its representations would be a disproportionate response. The majority (Deane, Dawson, Toohey and Gaudron JJ.) held that the respondent had been induced to assume that the defences would not be raised, had acted in reliance on that assumption, and that it would be unconscionable for the Commonwealth to depart from it. The equity could be satisfied only by holding the Commonwealth to the assumption. The appeal was therefore dismissed with costs.
Why the court decided this way
The majority reasoning, found in the judgments of Deane, Dawson, Toohey and Gaudron JJ., turned on the principles of equitable estoppel as they had been restated in Waltons Stores (Interstate) Ltd. v. Maher (1988) 164 C.L.R. 387. Deane J. explained that promissory estoppel is not a separate doctrine confined to equity but an emanation of the general doctrine of estoppel by conduct expounded by Dixon J. in Thompson v. Palmer (1933) 49 C.L.R. 507 at 547 and Grundt v. Great Boulder Pty. Gold Mines Ltd. (1937) 59 C.L.R. 641 at 674-677. That doctrine prevents an unconscientious departure from an assumption that one party has induced another to adopt as the basis of a course of conduct. The assumption may relate to a future state of affairs, including a legal state of affairs. The driving force is the prevention of unconscionable conduct that would cause detriment.
Dawson J. emphasised that the respondent and the Commonwealth were in a legal relationship once the writ was issued. The Commonwealth's deliberate course of conduct over a considerable period, not confined to the respondent but extending to other Voyager survivors, induced the assumption that the limitation defence and the no-duty defence would not be raised. That assumption was reasonable given the ministerial statements and the fact that damages had been assessed in other cases on the same basis. The respondent acted on the assumption by continuing the litigation, incurring expense and subjecting himself to the stress of proceedings in which damages were claimed for, among other things, anxiety and depression. The detriment was not limited to costs; it included the raising of false hopes and the strain of litigation against a defendant with the resources of the Commonwealth. Justice could not be measured solely in money. The equity raised could be satisfied only by holding the Commonwealth to the assumption.
Toohey J. approached the matter through the lens of waiver. He distinguished waiver in the sense of unilateral abandonment of a personal statutory right from election and estoppel. Section 5(6) of the Limitation of Actions Act barred the remedy but not the right and was procedural. It conferred a benefit on defendants that could be waived. The Commonwealth had, by its clearest communications and conduct, declared its intention to abandon the defence. That abandonment was not revocable once the relationship between the parties had changed to one in which the plaintiff was entitled to judgment on liability subject only to proof of damage. The same reasoning applied to the combat-exercise defence. Because the reply had not expressly raised waiver or estoppel in relation to the general denial of negligence, the matter was remitted for trial on negligence and damages, but the practical effect of the majority view was that the Commonwealth was bound by its admission of liability.
Gaudron J. agreed with Dawson J. She regarded the doctrine applied in Wilson v. McIntosh [1894] A.C. 129 and Phillips v. Martin (1890) 11 N.S.W.L.R. 153 as a sui generis principle that a party who deliberately fails to take an available point when it comes to notice, thereby changing the relationship of the parties, may be held to that changed relationship. The Commonwealth's original defence, its assurances and its joinder in applications for expedition altered the relationship to one in which the plaintiff was entitled to judgment on liability. The Commonwealth could not resile.
Mason C.J. and Brennan J., in the minority on the remedy, accepted that an estoppel arose but held that the detriment suffered by the respondent was limited to costs and inconvenience that could be compensated by an appropriate costs order. To hold the Commonwealth to its representations would be a disproportionate response. Brennan J. would have remitted the matter for an inquiry into the precise extent of the financial detriment and would have ordered the Commonwealth to pay compensation for it, after which the action would be dismissed as statute-barred. McHugh J. agreed that the detriment was adequately met by costs and that the equity did not require the assumption to be made good in full.
The court was therefore divided on the scope of relief, but the majority view prevailed. The appeal was dismissed because the equity raised by the Commonwealth's conduct could be satisfied only by preventing it from raising the defences.
Before and after state of the law
Before Commonwealth v Verwayen the law concerning waiver of statutory defences and the relationship between waiver and estoppel was unsettled. Cases such as Graham v. Ingleby (1848) 1 Ex. 651 and Park Gate Iron Co. v. Coates (1870) L.R. 5 C.P. 634 had recognised that a statutory condition precedent to the exercise of a right, if enacted solely for the benefit of an individual, could be waived. Wilson v. McIntosh [1894] A.C. 129 and Phillips v. Martin (1890) 11 N.S.W.L.R. 153 illustrated that a party who invoked the jurisdiction of a court on the assumption that a time limit had not expired could not later rely on the lapse of that limit. Craine v. Colonial Mutual Fire Insurance Co. Ltd. (1920) 28 C.L.R. 305 distinguished waiver (an intentional act with knowledge) from estoppel (which looked to the position of the party relying on the representation). Kammins Ballrooms Co. Ltd. v. Zenith Investments (Torquay) Ltd. [1971] A.C. 850 treated waiver of a defence as either election or estoppel. Waltons Stores (Interstate) Ltd. v. Maher (1988) 164 C.L.R. 387 had expanded promissory estoppel beyond pre-existing contractual relationships and emphasised that the remedy is the minimum equity necessary to avoid detriment.
Verwayen confirmed that a limitation defence that bars the remedy rather than the right is procedural and capable of waiver: see the discussion by Mason C.J. at the passages citing Dawkins v. Lord Penrhyn (1878) 4 App. Cas. 51 and Ketteman v. Hansel Properties Ltd. [1987] A.C. 189. It clarified that waiver in the sense of unilateral abandonment of a personal statutory right is distinct from election and does not require consideration, but it must be unequivocal and occur at a point when the relationship of the parties has changed. The case also illustrated the flexibility of equitable estoppel. The majority accepted that relief is not necessarily measured by the full extent of the assumption but by what is required to avoid detriment. Where the detriment is limited to costs, an order for costs may suffice (Mason C.J. and Brennan J.). Where the detriment is more extensive, or where the only way to avoid it is to hold the party to the assumption, the court may do so (Deane, Dawson, Toohey and Gaudron JJ.).
After Verwayen the law moved towards a more unified doctrine of estoppel by conduct that operates in both law and equity and extends to assumptions about future legal relations. The decision has been cited for the proposition that government representations about the conduct of litigation can found an estoppel when relied upon to a party's detriment. It also confirmed that the remedy for equitable estoppel is moulded to the circumstances and does not automatically require the assumption to be made good.
Key passages with plain-English translation
Mason C.J. (at the passage discussing the purpose of estoppel): "The fundamental purpose of all estoppels is protection against the detriment which would flow from a party's change of position if the assumption (or expectation) that led to it were deserted."
Plain-English translation: The whole point of estoppel is to stop someone suffering loss because they reasonably changed their behaviour on the faith of what another person led them to believe. The court does no more than is necessary to prevent that loss.
Brennan J. (at the passage on the element that attracts equity's jurisdiction): "The element which both attracts the jurisdiction of a court of equity and shapes the remedy to be given is unconscionable conduct on the part of the person bound by the equity, and the remedy required to satisfy an equity varies according to the circumstances of the case."
Plain-English translation: Equity steps in when it would be unfair for one side to go back on a promise that the other side has relied on. The court looks at all the facts and gives only the relief needed to stop the unfairness; it does not automatically force the promisor to keep the promise.
Deane J. (at the passage on the relationship between promissory estoppel and estoppel by conduct): "Promissory estoppel should be seen not as a separate and distinct doctrine which operates only in equity but as an emanation of the general doctrine of estoppel by conduct which had been explained by Dixon J. in Thompson v. Palmer and Grundt."
Plain-English translation: There is really only one doctrine of estoppel. It works the same way in common law and equity and covers promises about what will happen in the future as well as statements about existing facts.
Dawson J. (at the passage on the respondent's reliance): "The real detriment to the respondent was that he was induced by the assumption that the appellant would not insist upon the statute to allow the litigation to proceed for more than a year without taking any steps to bring it to a conclusion by way of settlement or, if necessary, withdrawal."
Plain-English translation: The sailor did not try to settle or drop the case because he believed the government would not fight him on liability or time limits. That lost opportunity and the stress of prolonged litigation were real harm that could not be fixed simply by ordering costs.
Toohey J. (at the passage on the change in relationship): "The Commonwealth's original defence, its assurances and its joinder in applications for expedition altered the relationship to one in which the plaintiff was entitled to judgment on liability subject only to proof of damage."
Plain-English translation: Once the government said it would not fight the claim and then acted as if that was its position, the legal relationship between the parties changed. The sailor was now entitled to win on liability. The government could not suddenly change the rules.
What fact patterns trigger this precedent
The decision is triggered when a defendant, particularly a well-resourced one such as the Commonwealth, makes clear and repeated representations that a particular defence (whether statutory or at common law) will not be relied upon, encourages the plaintiff to incur expense and emotional cost in proceeding on the basis that liability is admitted, and then seeks to resile from that position. The pattern includes: (1) an unequivocal assurance, often at ministerial level, that a limitation defence or a no-duty defence will not be pleaded; (2) conduct consistent with that assurance, such as joining in applications for an expedited hearing on quantum only; (3) reliance by the plaintiff who continues the action and forgoes opportunities to settle or discontinue; and (4) a late change of policy that would cause detriment beyond that compensable by costs. The precedent applies with particular force where the plaintiff is an individual claimant against the state and the representation has been made in the context of a class of similar claims. It does not apply where the representation is merely the omission to plead a defence at an early stage without positive assurances, or where the plaintiff cannot show reasonable reliance or detriment that cannot be cured by costs.
How later courts have treated it
The judgment itself treats earlier authorities as establishing that a limitation defence that bars the remedy is procedural and waivable: see the discussion of Dawkins v. Lord Penrhyn (1878) 4 App. Cas. 51 at 58-59, The Llandovery Castle [1920] P. 119 at 124 and Ketteman v. Hansel Properties Ltd. [1987] A.C. 189 at 219. Waltons Stores is treated as having removed the requirement of a pre-existing contractual relationship for promissory estoppel and as having identified unconscionability as the touchstone. Grundt is applied for the proposition that the real detriment is that which flows from the change of position induced by the assumption. Craine v. Colonial Mutual is cited for the distinction between waiver as intentional abandonment and estoppel. The judgment distinguishes Kerrison v. Martin & Heyward [1975] V.R. 401 on the ground that a unilateral waiver without consideration is not necessarily revocable once the relationship of the parties has changed.
The various judgments treat Legione v. Hateley (1983) 152 C.L.R. 406 as having accepted promissory estoppel in Australia and Foran v. Wight (1989) 168 C.L.R. 385 as confirming that relief is moulded to avoid detriment. The decision has been treated in subsequent cases as authority that equitable estoppel can arise in the course of litigation from representations about the conduct of a case, that the remedy is flexible, and that a costs order may suffice where the only detriment is financial expense. The minority view that relief should be limited to compensation for proved detriment has been cited for the proposition that estoppel does not automatically require the assumption to be made good. The case is also treated as confirming that a statutory limitation defence that is personal can be abandoned by clear conduct and that the doctrine of election does not arise from the mere filing of a defence.
Still-open questions
The judgments leave open whether a single overarching doctrine of estoppel by conduct has fully subsumed the separate categories of common-law estoppel, promissory estoppel and proprietary estoppel. Mason C.J. and Deane J. expressed sympathy for unification but the point was not necessary to decide. The precise boundary between waiver in the sui-generis sense recognised in Wilson v. McIntosh and equitable estoppel remains unclear; Toohey and Gaudron JJ. treated the facts as illustrating both, while Mason C.J. and Brennan J. preferred to analyse the matter solely through estoppel. The circumstances in which detriment will be presumed rather than proved, and whether increased stress and anxiety can constitute relevant detriment in the absence of medical evidence, were not finally resolved. The minority view that a costs order or compensation for out-of-pocket expenses will usually suffice where the only proved detriment is financial leaves open the question whether, in a case of prolonged litigation against the state, the raising of false hopes and the strain of contested proceedings can, without more, require the assumption to be made good. Finally, the judgments do not decide whether special rules of estoppel apply to the Commonwealth so as to expand or contract the field of operation of the doctrine; the point was not argued. These questions continue to require case-by-case analysis in light of the flexible conscience-based approach affirmed by the majority.