I'll have a crack at that.
I think we should stay with our own approach, and I believe that very strongly. The way housing is treated at the moment is very good in terms of a consumption-tax approach. The argument is that even if you look at this from the income tax viewpoint, there's not only the capital gains but also the imputed rent. So the return to the homeowner is the imputed rent on the house plus capital gains. We're not taxing those things, so we shouldn't be deducting the mortgage interest costs. That's a good way of looking at it.