I think that point is very well taken. You would get some resistance to the idea of someone external to the Prime Minister's dealings being able to provide oversight. There are going to be interactions that are confidential and that must necessarily stay so. There is a level of trust that we have to put in the people who are responsible for the screen.
I think you're absolutely right to point out that being subordinate to the Prime Minister means that you are in a conflict of interest. You care about his interests as much as you care about the public interest because you sit at his pleasure. There's no way to avoid that.
You could have part...or at least some sense of reporting back to the commissioner's office on an ongoing basis. That may have to go through the commissioner as opposed to through someone delegated by the commissioner.