My understanding--and I may have to be corrected--is that there will be a requirement for some legislation to actually transfer the responsibility to Parliament or some body of Parliament. In the current legislation the custodianship is given to Public Works, so that would have to be modified. Further changes or modifications and how they are done will depend on which mechanism is put in place--a single body like the chief architect in the United States, or a committee of senior officials, a board.
On April 22nd, 2010. See this statement in context.