“[49] It is a negotiation between a willing buyer (the contract breaker) and a willing seller (the party claiming damages) in which the subject matter of the negotiation is the release of the relevant contractual obligation stop both parties are to be assumed to act reasonably stop the fact that one or both parties would in practice have refused to make a deal is therefore to be ignored…”
“42. All depends upon the circumstances of the particular case. For example, the joint expert may be the only witness on a particular topic, as for instance where the facts on which he expresses an opinion are agreed. In such circumstances, it is difficult to envisage a case in which it would be appropriate to decide this case on the basis that the expert’s opinion was wrong. More often, however, the expert’s opinion will be only part of the evidence in the case. For example, the assumptions upon which the expert gave his opinion may prove to be incorrect by the time the judge has heard all the evidence of fact. In that event the opinion of the expert may no longer be relevant, although it is to be hoped that all relevant assumptions of fact will be put to the expert because the court will or may otherwise be left without expert evidence on what may be a significant question in the case. However, at the end of the trial the duty of the court is to apply the burden of proof and to find the facts having regard to all the evidence in the case, which will or may include both evidence of fact and evidence of opinion which may interrelate.”
“67. Where a single expert gives evidence on an issue of fact on which no direct evidence is called, for example as to valuation, then subject to the need to evaluate his evidence in the light of his answers in cross examination his evidence is likely to prove compelling. Only in exceptional circumstances may the judge depart from it and then for a good reason which he must fully explain. But if his evidence is on an issue of fact on which direct evidence is given, for example the speed at which a vehicle was travelling at a particular time, the situation is somewhat different. If the evidence of a witness fact on the issue is credible, the judge may be faced with what, if they stood alone, may be the compelling evidence of two witnesses in favour of two opposing and conflicting conclusions. There is no rule of law or practice in such a situation requiring the judge to favour or accept the evidence of the expert or the evidence of a witness of fact. The judge must consider whether he can reconcile the evidence of the expert witness with that of the witness of fact. If you cannot do so you must consider whether there may be an explanation for the conflict of evidence or for a possible error by either witness, and in light of all the circumstances make a considered choice which evidence to accept. The circumstances may be such as to require the judge to reach only one conclusion. 68. In my judgment in the circumstances of this case and on the evidence before her, the judge could only properly have chosen to accept the evidence of the expert there was by the close of the trial known surviving alternative explanation for the trailer toppling over other than it was travelling at an excessive speed. No other explanation was put forward by the defendant’s counsel in his closing submission and the judge held that none was shown. … In the circumstances there was no basis on which the evidence of the expert could be disregarded…”