“[38] I can summarise the principles in this way. The court has a jurisdiction, at least before the order is drawn up, to entertain an application of this kind as in here. The principle to be applied generally is the overriding objective to deal with cases justly and at proportionate cost. This involves dealing with cases expeditiously and fairly and allocating an appropriate share of the court's resources to a dispute. In a case like this one, in which the application is to amend the statement of case, call fresh evidence and then have a further trial, the principles relevant to amending pleadings have a role to play but the Ladd v. Marshall factors are also likely to have real significance. [39] As regards principles applicable to amendments, the modern view is probably the Court of Appeal in Swain v. Hillman[2001] All ER 91 . If the court would not have permitted the amendment before trial, it is hard to see how it is likely to be admitted after trial, apart from some very unusual circumstances. Nevertheless, just because a court would have permitted the amendment sought before, or even during the trial, if it had been raised at that stage, it does not mean that it should be permitted after judgment. [40] As to Ladd v. Marshall, the trial judge is in some ways in a better position than the appellate court to assess the significance of a new point and new evidence. In any case, at this stage the Ladd v. Marshall factors should be applied more leniently to an applicant than they might be applied in an appellate court; but, all the same, the Ladd v. Marshall factors are clearly relevant because the application is an attempt to call new evidence after judgment. If those factors, even applied more leniently, are against the applicant, it is likely that powerful factors in the applicant's favour will be needed to justify the application.”
“First, it must be shown that the evidence could not have been obtained without reasonable diligence for use at the trial. Secondly, the evidence must be such that, if given, it would probably have an important influence on the result of the case, though it need not be decisive. Thirdly, the evidence must be such as is presumably to be believed or, in other words, it must be apparently credible, though it need not be incontrovertible.”