@Mame,
That's what everyone is saying.
The problem arises from an institution with the power to carry out its own criminal investigation, prosecution and even the ability to deny an appeal.
We don't know what ministers knew, but Ed Davey, current Liberal leader, was the minister responsible during the coalition and he says he was lied to by the post office bosses.
The only thing I can say with any certainty, (and this is an actual prediction, I don't know for sure,) is that an effigy of Paula Vennells will be set on fire at the Lewes Bonfire Night festivities.