But what are the conditions under which the case can be brought again? Surely the evidence would have to be so compelling that it would, on the face of it, overturn the conviction/acquittal? (eg. a confession)
I doubt that the legislation would be ammended in such a way that the CPS could theoretically bring masses of cases against the same person for the same crime based on tenuous evidence.
If someone could point out what the changes and their conditions are, or paste a link where we can see them or something, maybe we'll be in a better position to argue how they could be abused.