The noble Countess raises an interesting point about pollution and the growth of algae and so forth in watercourses. Clearly, there is a balance to all of this, because part of the use of natural capital is indeed slowing the flow. The noble Countess is absolutely right that we need to ensure that watercourses are positioned so that there is a proper flow of water, but we also need to be mindful of the slowing of flow and the use of natural capital.