“We shall focus on the statutory language, as interpreted in the authorities, to identify the principle appropriate to this application. The single question is whether the interests of justice make a further inquest either necessary or desirable. The interests of justice, as they arise in the coronial process, are undefined, but, dealing with it broadly, it seems to us elementary that the emergence of fresh evidence which may reasonably lead to the conclusion that the substantial truth about how an individual met his death was not revealed at the first inquest, will normally make it both desirable and necessary in the interests of justice for a fresh inquest to be ordered. … [I]t is not a pre-condition to an order for a further inquest that this court should anticipate that a different verdict to the one already reached will be returned. If a different verdict is likely, then the interests of justice will make it necessary for a fresh inquest to be ordered, but even when significant fresh evidence may serve to confirm the correctness of the earlier verdict, it may sometimes nevertheless be desirable for the full extent of the evidence which tends to confirm the correctness of the verdict to be publicly revealed.”