The consequence of the appeal
30 Fundamental to Mr Woodgate's case is the submission that, once the appeal was successful, there was never a judgment or verdict in favour of Mrs McGuiness. It was avoided ab initio. Even if Keddies were entitled to payment after the verdict in the District Court, he maintains that they lost that entitlement after the appeal and must refund all of the money. The verdict was, he says, a condition precedent to Keddies' entitlement to payment which "disappeared" when the Court of Appeal handed down its decision.
31 Reversal on appeal generally annuls a judgment ab initio. However, a person may act under the authority of a judgment until reversed and such action is not avoided or invalid or unlawful (Antoniadis; Commissioner for Railways (NSW) v Cavanough (1935) 53 CLR 220 at 227; Wilde v Australian Trade Equipment Co Pty Ltd (1981) 145 CLR 590 at 603). Whether 'what has been done can be undone will depend upon the availability of appropriate remedies, to bring about the appropriate relief' (Wilde at 603). A change of position, made in good faith, is available as a defence against a claim for restitution (Lipkin Gorman v Karpnale Ltd [1991] 2 AC 548).
32 If the moneys were paid out by Mrs McGuiness under the mistaken belief that she was under a legal obligation to pay them or that Keddies were legally entitled to payment, those moneys might be recoverable by her or her estate. However, there is no evidence of a mistake of fact or law on the part of Mrs McGuiness. There is evidence, in the acknowledgement, that Keddies were not paid out under a mistaken belief that there would be no appeal.
33 Even if there were a mistake, if Keddies had adversely changed their position in reliance on the payment and honestly believed that they were entitled to receive and retain the moneys, they submit they have a defence to the claim (David Securities Pty Limited v Commonwealth Bank of Australia (1992) 175 CLR 353). In the present case, it is not suggested that Keddies had other than an honest belief in their entitlement to payment. Keddies submit that, following David Securities, restitution at the hands of Mrs McGuiness, or her trustee, is unavailable.
34 Keddies rely on the payment made pursuant to the authority as follows:
(1) They have changed their position between the verdict in the District Court and the allowance of the appeal.
(2) That change in position was in reliance on the authority.
(3) They acted in reliance on the authority and acted to their detriment in satisfying third party expenses without a right of recovery. They also acted in reliance on the authority in disbursing their own profit costs.
(4) It would be inequitable in all the circumstances to require restitution. Those circumstances include the absence of any demand or assertion of obligation to repay by Mrs McGuiness or the estate prior to the demand by the trustee and the absence of any allegation of want of good faith on the part of Keddies.
35 In David Securities the High Court said that the fact that a payment has been caused by a mistake is sufficient to give rise to a prima facie obligation on the part of the recipient to make restitution (at 379). The recipient has a defence if he or she can show that an order for restitution is unjust. One example is a change of position by acting to the recipient's detriment on the faith of the receipt of the moneys (at 385).
36 Mr Woodgate submits that this is not a "mistake of fact or law" case. He says it is a simple case of moneys had and received because the condition precedent under the contract did not exist once the verdict was set aside. This ignores the fact that a person may, as noted, act under the authority of a judgment until reversed. By the time the appeal was lodged, let alone determined, the moneys held in trust had been disbursed by Keddies pursuant to the authority (cf Roxborough v Rothmans of Pall Mall Australia Limited (2001) 208 CLR 516).
37 In my view, Mrs McGuiness was not labouring under a mistake when she authorised the payment to Keddies. She acknowledged that there may be an appeal and that she may be unsuccessful and may be required to repay the moneys (cf Hookway v Racing Victoria Limited [2005] VSCA 310 at [45]). Her payment was a voluntary payment. The consequence of that payment was that the costs agreement was brought to an end. The condition precedent under the contract did exist at that time.
38 Mason K and Carter JW (Restitution Law in Australia (Butterworths, 1995) at [415]) discuss the situation where a person pays to another moneys apparently due under a contract where the person:
'(1) has a conscious but mistaken understanding of the payer's legal obligation to pay or the payee's legal right to receive the money;
(2) intends to settle a claim honestly made by the payee; or
(3) knows the money is not due or has no belief one way or the other on the matter, but is willing to pay because of the relationship with the payee or some anticipated benefit.'
39 It is conceded that Mrs McGuiness had a legal obligation to pay and Keddies a right to receive the moneys after the District Court verdict and before the appeal was filed. There is no direct evidence of her belief at the relevant time and the onus is on her trustee to establish the nature of her intent if he wishes to claim restitution. The mere fact that Keddies required payment to be made does not, of itself, warrant the drawing of the required inference (David Securities at 368). Accordingly, category (1) does not apply. In light of the acknowledgment by Mrs McGuiness that an appeal was possible and that she might be ordered to repay the monies, absent further evidence, category (2) or (3) applies. For the reasons discussed in David Securities and as discussed by Mason and Carter at [415], the payment was voluntary and Mr Woodgate can not recover the moneys on behalf of the estate.