234 It follows that the view that it was the drafting of the February 2001 deed now urged for Mr Pritchard, that was the cause of DJZ's loss, may not be accepted. The 2003 agreement was the cause of the loss in issue, that being what the Court of Appeal's judgment turned on. As the High Court discussed in Tabet v Gett [2010] HCA 12; (2010) 265 ALR 227 at [66] and [69]:
"66 For the purposes of the law of negligence, "damage" refers to some difference to the plaintiff. The difference must be detrimental. What must be demonstrated (in the sense that the tribunal of fact must be persuaded that it is more probable than not) is that a difference has been brought about and that the defendant's negligence was a cause of that difference. The comparison invoked by reference to "difference" is between the relevant state of affairs as they existed after the negligent act or omission, and the state of affairs that would have existed had the negligent act or omission not occurred (Gregg v Scott [2005] 2 AC 176 at 181 - 182 [9]).
69 It may be that other cases in which it might be said that, as a result of medical negligence, a patient has lost "the chance of a better medical outcome" (for example, a diminution in life expectancy) differ from the present case in significant respects. These are not matters that need be further examined in this case. It need only be observed that the language of loss of chance should not be permitted to obscure the need to identify whether a plaintiff has proved that the defendant's negligence was more probably than not a cause of damage (in the sense of detrimental difference). The language of possibilities (language that underlies the notion of loss of chance) should not be permitted to obscure the need to consider whether the possible adverse outcome has in fact come home, or will more probably than not do so."
35 I did not accept that the possibility that Mrs James could have successfully appealed from the orders of Einstein J, for some reason other than Mr Pritchard's negligent drafting of the 2003 agreement; or that even if she could not, that DJZ would nevertheless have compromised its success in the proceedings before Einstein J in later settlement negotiations, which occurred after DJZ lost in the Court of Appeal, were necessary considerations in determining the question of whether or not DJZ had established that it had suffered the damage it claimed. Rather, I came to the view that DJZ had established the loss claimed.
36 While an assessment of the probability of things occurring may sometimes be necessary when damages are being assessed, I concluded that matters of the kind which are now sought to be pursued for Mr Pritchard could not sensibly be so regarded. This was not a question of any oversight.
37 The plaintiff's case that this aspect of the motion is an attempt to re-argue aspects of the case in a fashion which misconceives the issues before the Court at trial must be accepted. Its reliance on what the High Court said in Johnson v Perez [1998] HCA 88; (1988) 166 CLR 351 at 368, by reference to Willis v The Commonwealth [1946] HCA 22; (1946) 73 CLR 105 at 109 is well placed. There it was said:
"... where actual facts are known, speculation as to the probability of those facts occurring is surely an unnecessary second-best. Damages are awarded for injury actually suffered and for prospective injury. Prospective injury can only be estimated with more or less probability. But where the extent and character of what would at one time be described as prospective injury depends upon the happening or non-happening of a particular event and that event has in fact happened, it is unnecessary to speculate as to whether or not this event might happen and, if so, when. In such a case prospective damage (or diminution of damage) has become actual."
38 DJZ's case rested on what had, in fact, occurred in relation to the 2003 agreement and the consequence of reliance on that agreement before Einstein J and later in the Court of Appeal. That case succeeded. I accepted that the evidence established the prospect that the appeal would have failed, had Mr Pritchard not been negligent in drafting the 2003 agreement, taking the view that the result of this conclusion was that other probabilities and possibilities did not arise for consideration.
39 In the written reply submission it was argued for Mr Pritchard that the Court has not yet undertaken an assessment of damages by reference to 'the degree of possibilities and possibilities for the purpose of assessing damages'. Such an assessment was not undertaken because this aspect of Mr Pritchard's case failed. On the approach discussed by the High Court in Tabet v Gett [2010] HCA 12; (2010) 240 CLR 537, I accepted DJZ's case that the adverse outcome about which it complained had in fact come home, as the result of Mr Pritchard's negligence.
40 Again, I take the view that while undoubtedly more extensive reasons could have been given for the conclusions reached, the reasons which have been given are such that any jurisdiction to revisit the judgment, for the various reasons advanced, may not now be exercised. It is unquestionably possible that the Court of Appeal might take a different view to that to which I came. This was a complex case, involving a great deal of evidence, which resulted in very extensive written submissions which were also addressed orally at some length, as to a large range of issues and arguments advanced to support them. That I have not accepted that there were even further complexities which required the Court's resolution, in order to resolve the controversies which brought the parties to Court, is not a basis for undertaking the task now pressed.