“The second stage of the inquiry requires the case management judge or the trial judge to make what will often be a very difficult and sometimes a finely balanced judgment: whether evidence or some of it…which is ex hypothesi legally admissible, should be admitted. For the party seeking admission, the argument will always be that justice requires the evidence to be admitted; if it is excluded a wrong result may be reached…..the importance of doing justice in the particular case is a factor the judge will always respect. The strength of the argument for admitting the evidence will always depend primarily on the judge’s assessment of the potential significance of the evidence, assuming it to be true, in the context of the case as a whole. While the argument against admitting evidence found to be legally admissible will necessarily depend on the particular case, some objections are likely to recur. First, it is likely to be said that admission of the evidence will distort the trial and distract the attention of the decision-maker by focusing attention on issues collateral to the issue to be decided….Secondly, and again particularly when the trial is by jury, it will be necessary to weigh the potential probative value of the evidence against its potential for causing unfair prejudice: unless the former is judged to outweigh the latter by a considerable margin, the evidence is likely to be excluded. Thirdly, stress will be laid on the burden which admission would lay on the resisting party: the burden in time, cost and personnel resources, very considerable in a case such as this, of giving dislcoure; the lengthening of the trial, with the increased costs and stress inevitably involved; the potential prejudice to witnesses called upon to recall matters long closed, or thought to be closed;…..In deciding whether evidence in a given case should be admitted the judge’s overriding purpose will be to promote the ends of justice. But the judge must always bear in mind that justice requires not only that the right answer be given but also that it be achieved by a trial process which is fair to all parties.”