So what the SOP proposes is that the director-general would have the responsibility of directing local authorities to fluoridate—or not—their drinking water. But in doing so, before they made a decision, they would have to consider a range of things. I think the first one is just specified in the SOP: scientific evidence on the effectiveness of adding fluoride to drinking water, and it's reducing the prevalence and severity of dental decay. Just highlighting again, you want to do this once and well; you don't want to do this 20 times around the country. But then they also have to weigh up whether the benefits of adding fluoride outweigh the financial costs, taking into account the state of oral health in the population within the area that the territorial authority is responsible for, and also weighing up how many people would be affected by the water fluoridation. Then, also looking at the likely financial cost, but then weighing that up against the savings. But when you're doing that, making sure that you also take into account the ongoing management and monitoring costs of that. 