From my experience, ATIP coordinators with delegated authority make the decision on their own. I can't say that I'm aware of cases.... Obviously, ministers are the ones under whose name the decision is being made, and they have the power to make that decision themselves if they want to, but from my experience, this is not a power that's being exercised, certainly not on a frequent basis.
On June 5th, 2007. See this statement in context.