The primary judge did not err in holding that the respondent had suffered relevant "detriment"
23The appellant's first argument, that the respondent suffered no detriment by any change of position involved in expending money to acquire his interest in Farm 1077, does not address any of the respects in which the primary judge considered that the respondent would suffer detriment. Nor does it address any argument put on behalf of the respondent because the respondent did not maintain, either before the primary judge or in this court, that the payment of $225,000 to purchase the interest in Farm 1077 itself constituted or involved financial detriment. More fundamentally it must, in any event, be rejected at a factual level. The respondent's evidence was that the farm would not have sold in 2000 without the water rights for more than $500,000 and if it was sold with the water rights it would have sold "for more than $500,000": Black 83P-V, 85M. He also agreed that if he was buying his brother's interest for $200,000 and that interest included the water rights, he would have been paying less than its "true value": Black 85P. However, it did not follow from this evidence that assuming he was acquiring interests in the land and shares, that he did so at an undervalue. On the contrary, the evidence indicates that the respondent paid $250,000 for a 40 per cent interest in the land. If that interest also carried with it the appellant's 40 per cent interest in the MIL shares, the value attributed to the land and water rights was $625,000. Thus, the respondent's evidence was that the farm alone would not have sold for more than $500,000 whereas he had paid the equivalent of $625,000 on the assumption that he was also receiving the water rights. Contrary to the appellant's submission, this evidence would justify a conclusion that the respondent paid the appellant an amount for his 40 per cent interest in the land which was in excess of his view as to its value without the benefit of the water rights. To that extent it would support the argument referred to above but not made by the respondent.
24The appellant's second argument ignores the respondent's evidence that he would not have purchased his brother's interest in Farm 1077 in the absence of the encouraged expectation. That is a sufficient basis for rejecting the argument which does not, in any event, address any of the respects in which the primary judge considered that the respondent had suffered detriment. Specifically, it does not address the detriment consisting of the lost opportunity to negotiate for the acquisition of the interests in the property and shares before the respondent's change of position in purchasing the property.
25The appellant's third argument does address that fourth respect in which the primary judge held that the respondent suffered relevant detriment but also must be rejected. The primary judge did not identify the time at which the opportunity to negotiate a purchase of the appellant's interest in the MIL shares would have first arisen. The time when the respondent had and lost that opportunity was before he changed his position by purchasing his brother's interest in Farm 1077. That opportunity was to negotiate in the following circumstances to acquire that interest together with the interest in the MIL shares. The appellant desired to sell his interest in the property. The Walsh family wanted to dissolve their existing partnerships so as to separate the interests of the various family members, including those of the appellant and the respondent. There was no ready market for the sale of the MIL shares and water entitlements separate from the landholdings to which they related. To the extent that such shares and entitlements were transferable separately from a landholding, they had a value which was much less than their value in 2008. More significantly, the appellant and respondent were co-owners of the landholding and MIL shares and in the absence of agreement as to the acquisition by one of the other's interests, the land and shares would have to be sold, either by agreement or by the appointment of a trustee for sale. Finally, as the evidence referred to above indicates, the respondent was prepared to pay an amount for the appellant's interests in the property and MIL shares which attributed some value to the shares and water entitlements.
26The prospect of the respondent negotiating an acquisition of both interests for the same price as was paid in June 2000, or a price which was not substantially different, was not fanciful or unrealistic. The appellant did not have the option of selling his interest in the land and holding his interest in the shares and would have had to take a market price for both in the event of a forced sale. As Allsop P observes in Delaforce v Simpson-Cook at [5], the fact that the party encouraged cannot show "that he or she would have been better off in the posited alternative reality is not fatal to the making out of the estoppel. Indeed, the inability to prove such things reveals a central aspect of the detriment: being left, now, in that position".
27The respondent's position was quite unlike that of the plaintiff in Barnes v Alderton. She alleged that her brother had promised to give her half of the proceeds of sale of a property owned by him when it was sold. She had made no contribution by way of expenditure on the property. Young CJ in Eq held that her claim to an estoppel by encouragement failed for at least two reasons. First, the statement of the brother was no more than a statement of present and revocable intention. It was not given and understood as tantamount to a promise: Barnes v Alderton at [58], [60], [62]. Secondly, there was no detriment flowing from her alleged change of position. The plaintiff said that if the statement had not been made to her, she would have taken steps to formalise an arrangement with her brother. However, there was nothing she could have done to improve her position as the beneficiary of a mere statement of present and revocable intention, either by way of negotiating with her brother or taking proceedings under the Testator's Family Maintenance Act 1916: Barnes v Alderton at [63], [64].
28Although the appellant did not address specific arguments to the remaining three respects in which the primary judge held that the respondent would suffer detriment, I propose to address them shortly because the primary judge does not expressly identify, in relation to any of them, the change of position by the respondent from which the detriment "would flow" if the encouraged expectation was departed from.
29As to the first and third of those respects, the only possible change of position would appear to be the respondent's acquisition of his brother's interest in the property in June 2000. Had he not done so, unless in the meantime he had reached agreement with his brother to acquire those interests, the respondent would have remained a co-owner with the appellant and faced the risk of a forced sale of the property and shares. Thus, in the absence of agreement, he would have faced a risk of losing the property and water entitlements and, if they could be dealt with separately, he also would have faced the risk of holding the property as co-owner without the benefit of the water entitlements. He would not, however, have faced the risk of holding the property as sole owner without the benefit of any water entitlements. To that extent these two respects identify a detriment which would arise from the respondent's change of position. It is unnecessary to address the more difficult question whether that detriment was sufficiently substantial to make it unjust or inequitable to allow the appellant to repudiate the expectation created: Gillett v Holt [2001] Ch 210 at 232.
30As to the second respect in which the primary judge found detriment, the only change of position which could possibly give rise to the detriment identified was that the respondent abstained from making some provision for any ongoing liabilities to the appellant. Exactly how those liabilities would arise and what would be their quantum are not clear. More significantly, the respondent did not give evidence, and it is not obvious, that had he appreciated that he had not acquired his brother's interest in the water entitlements, he would have made an ongoing provision for some amount. His case was that but for the encouraged expectation he would not have acquired his brother's interest in Farm 1077 and accordingly he would not have had to address the making of any such provision. For these reasons the primary judge's conclusion as to this detriment is not supported by the evidence and does not flow from the respondent's change of position in reliance upon the encouraged expectation.