This may not be as relevant to passing the main estimates, for instance, but I would certainly encourage departments taking major policy steps—such as buying the F-35—to provide updates on how much they think it's going to cost and how much it's going to cost over time. I know the Parliamentary Budget Officer, who is an officer of Parliament, has certainly weighed in on this issue, and I think it's important for government departments themselves to keep up with the current news on the F-35s and update their numbers, or not, but at least lay their methodology out for examination by parliamentarians and outside observers.
On February 27th, 2012. See this statement in context.