Okay, I'm going to suggest that I'm not a lawyer, so please correct my understanding of what I heard you say, which is that the Minister of Transport's dependants—in this case it would be those who report to him—aren't in a position where legally they can supervise the discharge of responsibilities of the minister of another department when they want to do things in their own department.
On February 7th, 2008. See this statement in context.