That's a role we play at different stages in the process.
When an ad first comes in to us, or when we work with a government department, typically it's at the very beginning of the process. When they give us a call and tell us, “We're going to mount an ad campaign”, the first thing we have to ensure--it's in your nice little “roles and responsibilities” there--is that it's a campaign that has been approved in the government ad plan.