It is convenient, in the first place, to consider the claim for contribution.
24 This claim is not based upon statute. It is based upon a doctrine, the classical statement of which is found in Dering v Earl of Winchester, (1787) 1 Cox 318; 29 ER 1184, a case concerning contribution between co-sureties. It was there stated:
"…In all these cases the sureties have a common interest, and the common burthen they are joined by the common end and purpose of their obligations, as much as if they were joined in one instrument, with this difference only, that the penalties will ascertain the proportion in which they are to contribute, whereas if they had joined in one bond, it must have depend upon other circumstances…"
25 Another general statement of principle is to be found in Story, Equity Jurisprudence (3rd ed, London, para 493) where the statement is made:
"The claim certainly has its foundation in the clearest principles of natural justice; for as tall are equally bound and are equally relieved, it seems but just that in such a case all should contribute in proportion towards a benefit obtained by all, upon the maxim, Qui sentit commodum, sentire debet et onus. And the doctrine has equal foundation in morals; since no one ought to profit by another man's loss where he himself has incurred a like responsibility. Any other rule would put it in the power of the creditor to select his own victim; and, upon motives of mere caprice or favouritism, to make a common burden a most gross oppression. It would be against equity for the creditor to exact or receive payment from one, and to permit, or by his conduct cause, the other debtors to be exempt from payment…"
26 For present purposes the statement of principle made by Kitto J in Albion Insurance Company Limited v Government Insurance Office of New South Wales, (1969) 121 CLR 342 at 349-350, in a case involving double insurance, provides a focal point. His Honour said that "the general doctrine of contribution…forms part of the common law" and stated that "a principle applicable at law no less than an equity, is that persons who are under co-ordinate liabilities to make good the one loss (e.g. sureties liable to make good a failure to pay the one debt) must share the burden pro rata…".
27 It is asserted on behalf of GIO that this principle, stated in various ways in the authorities, requires that Colemans should contribute to the loss that it has suffered as a result of the judgment given against it in these proceedings. On behalf of Colemans, it is submitted that the principle does not apply. The case is not one of co-ordinate liability and there is no "loss" to which the firm can be required to contribute.
28 Some shortening of the proceedings has been achieved by a sensible concession made by Colemans. It is accepted that GIO's quantification of its total claimed loss is $298,246.90 and it is agreed that in the event of Colemans being liable to contribute, then its contribution should be one-half of that amount.
29 I find it helpful to analyse the case in the following way. The basic cause of the problem was the undue influence exercised by his father over McNally. As a result of this influence he was induced to make his home available as security for the borrowing of in excess of $300,000 from GIO and to incur a personal debt to GIO in that sum together with other payments required from him by the mortgage contract. He incurred this debt and submitted to the security obligations in circumstances where the money borrowed was to be made available to his father for business purposes which involved the risk of its loss, which in fact occurred. The combination of the loan to him and its security by way of a mortgage placed upon the title to his home diminished his legal rights in respect of his home and reduced its value to the extent of the financial obligations imposed by the mortgage.
30 As has been held, GIO was constructively aware, prior to making the loan and obtaining the mortgage, that McNally was dealing with them in relation to these matters whilst under the undue influence of his father. Being in possession of that knowledge it both could and should have, in the interest of McNally, refused to enter into the transaction at all.
31 Mr Cockburn, on behalf of Colemans, was aware that the money was being borrowed for the purposes of the father in circumstances where McNally could be in danger of losing his home. He was also aware of the facts indicating that the transaction was being entered into as a result of influence being brought to bear on McNally by the father. It was found by Cohen J that, had he issued a very strong warning to McNally, then it was most unlikely that McNally would have entered into the transaction. He did not do so and, acted for McNally in relation to the mortgage and provided documentation which facilitated its implementation.
32 In these circumstances both GIO and Colemans could, on the findings of fact made in the proceedings, have prevented the loan and the mortgage.
33 Does this analysis produce the result that GIO and Colemans "are under co-ordinate liabilities to make good the one loss"?
34 Counsel, with commendable diligence, have taken me to a large number of authorities dealing with contribution between co-obligors. In many of them, there is to be found an extensive discussion of earlier cases. I do no propose to enter into any such discussion in this case; nor do I find it necessary to refer to the authorities. I am satisfied, with respect, that I can safely follow the statement made by the learned authors of Meagher, Gummow and Lehane Equity Doctrines and Remedies, 3rd ed, Butterworths, 1992, where they state an overall test as follows:-
"….the proper view appears to be that contribution may be recovered where the liabilities of the co-obligors to the principal claimant are such that enforcement by him against either co-obligor would diminish that obligor in his material substance to the value of the liability. Any alternative or additional requirement in the doctrine of contribution of similarity or consubstantial nature between the liabilities to which the co-obligors are exposed would produce intolerable uncertainty and obscure the true objects of the doctrine."
35 The basis contention made on behalf of Colemans is that McNally suffered no relevant loss to which Colemans could be ordered to contribute. All that happened was that he entered into an unenforceable arrangement of debt and security. With respect, I do not accept that this is a proper characterisation of "loss" in the present case. In the first place the loan and mortgage were not nullities. They existed with full legal effect until set aside by order of the Court. (See Kerr on Fraud and Mistake, 7th ed. p.7 and cases there cited). In my opinion, the true "loss" suffered by McNally occurred when he entered into the arrangements which, at the time of such entry, diminished his financial position and the value of his home. That loss could have been corrected by his obtaining either an award in damages equivalent to the value of the loss, against Colemans or appropriate orders against the lender, GIO preventing it from recovering the debt or enforcing its security.
36 He chose to do the latter and, thereby cast upon GIO the full financial burden of restoring him to a situation from which he had departed only because of breaches of duty owed to him, in different ways, by both GIO and Colemans.
37 In my opinion, viewed this way, the case falls squarely within the broad, general principle relating to contribution, to which I have made reference.
38 There remains for consideration the submission of Colemans that GIO should not be permitted to maintain its claim for contribution because of its failure to include it in the first proceedings. The claim is based upon the principles laid down in Anshun. It is fair to say that this claim was put forward by Colemans without any great show of enthusiasm.
39 It is clear that a claim for Anshun type estoppel presents a Court with the need to make a discretionary decision. Again, I have been referred to a number of authorities in the careful arguments of counsel both written and oral. I do not consider that I need to make reference to any of them, it being sufficient to refer to the remarks of the majority in the case itself (at p. 602), after a consideration of a number of decided cases. Their Honours (Gibbs CJ, Mason and Aickin JJ) said:-
"In this situation we would prefer to say that there will be no estoppel unless it appears that the matter relied upon as a defence in the second action was so relevant to the subject matter of the first action that it would have been unreasonable not to rely on it. Generally speaking, it would be unreasonable not to plead a defence if, having regard to the nature of the plaintiff's claim, and its subject matter it would be expected that the defendant would raise the defence and thereby enable the relevant issues to be determined in the one proceeding."