I think that there is a great deal of scope over the next few years to examine models such as that. At the moment, of course, two taxes are devolved; income tax will soon follow. I think, first of all, it's important to bed the system in, but I do think there is the opportunity for debate across political parties, and in political parties, to see what kind of tax system we would want in Wales. There are positives and negatives with council tax, of course. We know that there are some people who pay a high level of council tax whose incomes are actually quite low. We know as well, of course, that, with things like a local income tax, the question then arises of: do you pay where you live, or do you pay where you work? These things have to be looked at carefully, and I'm sure they'll form part of the debate over the next few years.