I think it has to be a combination. On homeowners and homes, I think you need to increase regulation consistently so that homes are being built to higher levels of performance. I think it's really important in the residential sectors.
In the private sector, I think you're better off with tax rebates, with financial-type incentives, because they're looking for return on their investment, whereas the homeowner looks for other things. It's a combination, depending on the sector you're targeting.