Sir, at this point that would be speculative. I think we can refer you to the fact that they've now done an estimate of the cost difference—their belief in the cost difference—using parametric models to look at the O-and-S cost, operating and support, per flying hour for the F-35. You'll see on page 84 that they actually give you the flying hours for the F-35A versus the other variant. We've provided a kind of illustrative calculation of that, and you can now start to see those indications.
To your first question, it is useful now to start using these reference points to look at what's reasonable. I think it's the same point about parametric modelling and the use of it: what's reasonable.
If points start to converge, then at least, from a parliamentary point of view, there's a richer planning environment. You can have a little more confidence going forward.
We caution that they're all estimates at this point. But to your first question, it becomes interesting when they start to converge. That's why we think the latest report published just five weeks ago from the U.S. Department of Defense is very handy in that regard.