"Where, as here, a defendant announced the closing of its case and, there being no case in reply, a short time later sought leave to re-open because its counsel realised he had made a mistake it is difficult to discern how the interests of justice would be furthered by disallowing an application to re-open to call evidence which was clearly relevant to, and may have had a significant impact on, the issues in the case. It is true that the fact that there has been a deliberate decision not to call the witness whose evidence it is later sought to lead in a re-opened case is a relevant consideration. But there may be a number of reasons why a deliberate decision is made. It may, for instance, be made for tactical reasons.
On the other hand it may be that in the heat of the moment counsel has inadvertently overlooked facts proven in the opponent's case or has otherwise acted on some misapprehension. Where the failure to lead evidence from a witness whom it is afterwards desired to call results from a tactical decision by counsel the courts will usually be disinclined to grant an application to re-open. Even in these circumstances, however, the court has a discretion to grant an application by a party to re-open its case and the interests of justice may dictate that the application be allowed. In short the fact that a deliberate decision was taken for tactical reasons is not decisive but remains an important factor.
If, however, counsel inadvertently fails to call a witness different considerations arise and, as it seems to me, if counsel makes a deliberate decision based on a mistaken apprehension of the nature of the evidence called against his client or the admissibility of the evidence which he seeks to call the justice of the case may well point to the granting of the application. The decision made by counsel in this case although a deliberate one stands in a very different category from one based on tactical grounds. It is more appropriately regarded as one in which counsel had made a mistake or failed to appreciate the relevance and admissibility of the evidence which he omitted to lead."