62 The next issue is: did the Plaintiffs' e-mail to the Defendant's agent on 24 April 2007 requesting an extension of time to comply with the Defendant's Notice to Complete operate as a waiver of the Plaintiffs' rights or as an election to affirm the contract.
63 The content of, and the distinctions between, the principles of waiver, election and common law estoppel are difficult and uncertain areas of the law, much discussed in judgments: see Agricultural & Rural Finance Pty Ltd v Gardiner (2008) 238 CLR 570, at [50] ff. A judgment at first instance is not the occasion for another essay on the topic. I shall state the principles as I understand them, as briefly as I may, and will explain how I apply the principles to the issues in this case.
64 "Waiver" in the present case is not used in the sense of estoppel: Mr Stoljar expressly abandoned estoppel as a defence in his final submissions because he conceded that he could say nothing about detrimental reliance.
65 "Waiver" cannot be used in this case in the sense of "abandonment and dissolution of the contract": Gardiner at [52]. The contract for sale between the parties had already been terminated by the time that the Plaintiffs sent the e-mail of 24 April. Likewise, "waiver" could not be used in the sense of abandonment or renunciation of a right (Gardiner at [49]): the Plaintiffs had no right to terminate a contract which was, in fact, already terminated. The legal consequences of termination inevitably followed by operation of law.
66 "Waiver" can mean that a party to a contract does not insist upon a term of the contract which is for that party's sole benefit: Gardiner at [52]. There could be no waiver in that sense in the present case because the entire contract had already been brought to an end.
67 In truth, therefore, the Defendant's reliance upon "waiver" is in the sense of "waiver by election" (Gardiner, at [56]):
"In this court an intentional act, done with knowledge, whereby a person abandons a right by acting in a manner inconsistent with that right has been described as the 'waiver' of that right. But as later demonstrated, many such cases are applications of the doctrine of election between inconsistent rights. The same may be said of election between inconsistent remedies such as damages and an account of profits."
68 This is not a case of equitable election because the Plaintiffs do not choose to take the benefit of the contract while rejecting a burdensome condition of the contract: see Gardiner at [57]. If there is an election at all in this case, it is an election at common law (Gardiner, at [58]):
"The doctrine of election is long established at common law. As Jordan CJ pointed out in O'Connor , '[s]ince the days of the Year Books it has been recognised that you cannot have the egg and the halfpenny too' . If, then, something happens which gives rise to the existence of two alternative rights, and one of those rights is satisfied, the other is no longer available. A breach of contract by one party always gives the other party a right to recover damages for the breach. If serious, the breach will give the innocent party the right to treat the contract as at an end. But the innocent party need not accept the repudiatory breach and avoid the contract; the innocent party may choose to insist upon further performance. And as Craine shows, the exercise, despite knowledge of a breach entitling one party to be discharged from its future performance, of rights available only if the contract subsists, will constitute an election to maintain the contract on foot."
69 It is of the essence of the doctrine of election that there be in existence mutually inconsistent rights available to the electing party so that exercise of one of those rights automatically precludes exercise of the other. The classic example is a contracting party's choice between the right to rescind the contract for the other party's serious breach and the right to insist on performance of the contract, claiming damages for the breach. It is important to recognise that, outside the special realm of the conduct of litigation where special considerations may apply - see the discussion of Commonwealth v Verwayen (1990) 170 CLR 394, in Gardiner at [62] - election, as distinct from estoppel, applies to a choice between legal rights, not to a choice merely between possible courses of action.
70 What legal rights relating to the contract for sale did the Plaintiffs have as at 24 April 2007? They had no right either to rescind or to insist on performance of the contract for sale: the contract was already dead for all purposes and the Plaintiffs had no right to revive it unilaterally. The only rights which the Plaintiffs had in relation to the contract flowed from its termination, i.e. they had a right to receive their deposit back. As at 24 April, the only way that the contract for sale could have been 'brought back to life' so that the Defendant could later rescind it for non-compliance with a Notice to Complete was if the Plaintiffs had represented that the contract was still alive and the Defendant had detrimentally relied upon that representation, so that the Plaintiffs were then estopped from asserting that they had validly rescinded on 13 March 2007. However, as I have said, the Defendant has eschewed a case of estoppel based on detrimental reliance.
71 Accordingly, I am of the view that the Plaintiffs' 24 April e-mail was not an election between two mutually inconsistent legal rights relating to the contract for sale. It was nothing more than the Plaintiffs taking a certain course of action to try to keep their options open.
72 The Defendant's case on election therefore fails. I hold that the Plaintiffs are entitled to a declaration that they validly rescinded the contract for sale on 13 March 2007.
Damages