Prudent or not, as I say, that would be a policy decision. There is a regulatory process. The regulatory process is that—you're quite right—there is a RIAS and it's published. They are published once the consultations are...there's a good idea of what the regulation would look like.
But I think what we've said is, how much will the 2020, in general, cost? Is it going to be less, for example, than the Kyoto period? Is it going to be more than the Kyoto period?