Counter-Terrorism Bill

Can the Minister expand a little on why the public interest immunity system that stood the test of time for so long is not now viewed by the Government as adequate, which is why they want to bring these provisions back, I understand, in the coroners Bill? Or is there a different reason? I understand the frustration of the noble and learned Lord, Lord Lloyd of Berwick, that we are pursuing this matter in depth, but that is important if we are to be asked to look at it again in what could be only a couple of months from now.