Well, you sort of answered your own question a little bit there, Mark. But, as I said before, we are absolutely looking at a fabric-first, worst-first kind of approach, but it's very difficult to just target one house sometimes. So, in my statement, I alluded to the fact that we're looking at community energy programmes. We're working with local authorities to do an energy map across Wales, so that we know where communities with the least energy-efficient housing are to see if we can do a community upgrade that will allow us to use social housing levers to help the whole community come up, if you like. So, it's quite difficult to just target one house in the middle of a cluster otherwise. We're also, as I've said many times, looking to make sure that we do the right thing for the right house.

On Nest, I just don't have enough money to do everything that I'd like to do to everyone's house. So, trying to do something for a large number of people as opposed to a lot for a smaller number of people is always one of the most difficult balances that we have. So, we constantly look to see whether it's better to help more people do one thing than it is to help very much fewer people do everything, and I'm afraid that's one of the balances we're constantly wrestling with. I'm very happy to work with the committee about where to hit the right balance for all of that.