21 At 294 [22] their Honours noted that "the doctrine of equitable contribution is founded on concepts of fairness… and natural justice". They referred to the judgment of Kitto J in Albion Insurance Company Limited v Government Insurance Office of New South Wales (1969) 121 CLR 342 at 351. His Honour there said that in the context of equitable contribution, natural justice requires that one of several persons who has paid more than his fair share towards a common obligation is entitled to be recompensed by those who have not.
22 McHugh J dealt with the basis on which equitable contribution is ordered at 298 [38] and following. His Honour noted that the principle of equitable contribution is "based on the equitable doctrine of equality. When a person pays more than his or her share of a common monetary obligation, the payment pro tanto discharges the obligation of all who owe the common obligation ... [i]n accordance with the maxim that equality is equity, equity requires the common burden to be shared equally so that none of those owing the common obligation will pay more than his or her share of the burden. An order of contribution prevents the injustice that would otherwise flow to the plaintiff by the defendant being enriched at the plaintiff's expense in circumstances where they have a common obligation to meet the liability which the plaintiff has met, or will meet ... "
23 His Honour discussed a number of cases, and a number of relationships, in which the obligation of equitable contribution had been analysed and applied. He said at 300 [41] that in general, the essential foundation for establishing an entitlement to contribution was that there be "a common interest and a common burden." His Honour said that "[t]he nature of the relevant interest and burden is such that the discharge of the burden by one party constitutes a benefit to the other or others which, in fairness, the law cannot countenance them keeping".
24 Mr Donaldson submitted that the effect of the deed of release was that Mr Thomas had no liability (either from the date of the deed or from the date the consent orders were made; it does not matter) to REL. Thus, he submitted, if Messrs Carr and Purves were found liable to REL, and made payment, Mr Thomas would receive no benefit because the payment would not - could not - satisfy pro tanto any obligation that he had, or has to REL.
25 On that deceptively simple basis, Mr Donaldson founded the application for summary dismissal.
26 Mr Martin pointed to the high threshold test for a summary dismissal claim: referring to the oft cited statement of Barwick CJ in General Steel Industries Inc v the Commissioner for Railways (NSW) (1964) 112 CLR 125 at 130. He accepted, however, that if what were involved was a question of law, and that nothing relevant for the resolution of that question could come up through the processes of pretrial preparation, or in the course of the hearing, then a resolution of the question of law could ground an order for summary dismissal. Mr Martin did reserve the question where the law was contentious or unsettled, but did not I think suggest that this was such a case.
27 In dealing with the substance of the application, Mr Martin submitted that the deed of release should not be construed as having effected a release of Mr Thomas. He relied on the principle established, in relation to cases of joint or joint and several liability, that where it appears from the terms of the release of co-obligors that the releasor intended not to release its rights against the other co-obligors then the release would be construed only as a covenant not to sue.
28 The principle is well established, even if the jurisprudence that has led to its formulation is based on the need to avoid the consequences of a rather peculiar doctrine of the common law that the release of one of a number of joint and several debtors releases all joint and several debtors. The principle was discussed by McClelland CJ in Eq in Dorgal Holdings Pty Limited v Buckley (1996) 22 ACSR 164 at 167. That was a case where three directors of an insolvent company were sued by a creditor of the company, in reliance on what was then s 592 of the Corporations Law. The plaintiff and one of the directors entered into a deed of release, whereby that director agreed to pay a certain amount, and the plaintiff agreed to release that director completely. Orders were in due course made giving effect to the compromise. The deed contained an explicit reservation of rights against the other directors.
29 McClelland CJ in Eq referred at 166 to the general rule of the common law. He said that whether or not the rule was well founded was not an open question, as it had been expressly applied by the High Court of Australia in Walker v Bowry (1924) 35 CLR 48.
30 However, his Honour pointed out, there was a qualification to the general rule. That qualification was stated in cases such as Re EWA Limited [1902] 2 KB 642 and Commercial Bank of Tasmania v Jones [1893] AC 313. His Honour stated that the qualification was to the effect that if, on the true construction of the release, that which purports to be a release was intended not to operate as a release of the whole obligation then it will be treated as a covenant not to sue rather than a release. The question of construction could be informed (for example) by a reservation of rights against those who are said to be liable and who were not released.
31 The existence (and binding nature) of the common law rule, and of the exception to which McClelland CJ in Eq referred, cannot be doubted. The question is whether they have any relevance in the present case.
32 There is a separate question, which Mr Donaldson accepts cannot be resolved on this application, as to whether or not the alleged liability of Messrs Carr, Purves and Thomas to REL is joint, joint and several, or several. So far as the proposed amended cross-claim statement can be understood on the point, it does not appear to suggest joint or joint and several liability. Nor does it appear to suggest that the alleged liabilities to REL arose out of some common undertaking or venture. But in circumstances where the point was not addressed, and where clearly its resolution would require findings of fact, I do no more than record my doubt that it would be in truth a joint liability.
33 Mr Donaldson submitted that this did not matter, because even if the deed of release were to be construed merely as a covenant to sue, the relevant effect was the same: Mr Thomas had no liability to REL that could form the subject of a common burden to the satisfaction which Messrs Carr and Purves might contribute pursuant to any judgment against them.
34 In many ways, I think, the submissions for the parties addressed different issues. However, as I see it, the real issue raised by the application for summary dismissal is whether, on the proper construction of the deed of release (and assuming, for present purposes, that the release purportedly given may be no more than a covenant not to sue) Mr Thomas can have any liability to REL in respect of which he might be liable in equity to contribute to any payment made by Messrs Carr and Purves to REL.
35 The basis on which equitable contribution is ordered, as the cases to which I have referred make clear, is that a payment by one person under a common obligation with others, which has the effect of benefiting those others by diminishing the common obligation, ought be shared among them. It is fundamental to the existence of a right to equitable contribution that there be a common obligation to meet the one burden, or make good the one loss. If there is no common obligation then there is nothing on which the principle of equitable contribution can operate.
36 Further, as the decision in Albion makes clear, it does not matter whether the common obligation is joint, joint and several or several. In cases between insurers (of which Albion was an example) the obligation will ordinarily be several. In other cases (including some of those discussed by McHugh J in Burke) the obligation will be joint, or joint and several. It has not been suggested that the right to equitable contribution depends on a classification of the nature of the common obligation as joint, joint and several, or several.
37 In those circumstances, it seems to me to be inevitable that the effect of the deed of release, even reading it as no more than a covenant not to sue, is that since the deed was executed or since the joint orders were made (and I repeat that it does not matter which date is chosen) Mr Thomas had no liability to REL which could be enforced against him by REL in respect of the subject matter of the proceedings.
38 It follows that if REL succeeds against Messrs Carr and Purves, and they pay REL, Mr Thomas will receive no benefit. He will receive no benefit because no contingent or for that matter crystallised) liability that he has to REL will have been satisfied, either completely or pro tanto, by the payment. That is because he has no such liability.
39 Thus, I think, the effect of the deed of release is to take away a fundamental and essential element that Messrs Carr and Purves must prove if they are to make good their claim for equitable contribution. They cannot recover equitable contribution from Mr Thomas because he has no common obligation with them to REL. I am not sure that it matters that the date of the deed preceded the date on which the cross-claim was brought; certainly this cannot detract from the strength of Mr Thomas' position.
40 I therefore conclude that the claim for summary dismissal has been substantiated. In each proceeding, I make an order in accordance with prayer 1 of the notice of motion filed for Mr Thomas on 30 July 2008. I will hear the parties on costs.
41 I order the cross-claimants to pay Mr Thomas' costs of the proceedings including the notices of motion.