The establishment has it all sown up.
Even more politically toxic was the investigation made clear that front line officers were operating under guidelines which had been drawn up after consultation at the very highest levels of both the security services and government. Despite having pleaded ignorance at every turn, or completely ignored much of the questioning, it seems that ministers were the ones authorising just what agents could and couldn't do, as has been suggested by the documents that came to light in Libya.
With the horse having well and truly bolted, the government now of course wants to ensure that any such unpleasantness in the future can never emerge in the same way. With that sown up, and the laughable Gibson inquiry apparently stuck in limbo as more investigations unlikely to lead to a prosecution take place, the chance of anyone being held to account diminishes with each passing month.