We are at one in saying that we need to encourage the separation and recycling of high-volume, low-density materials such as plastic. The question is whether setting targets by volume as well as by weight is effective. I would question it. If it was a mechanism rather than another way of measuring, that would be another matter. The question is how to deal with the problem. Why should measuring by volume be of such great assistance when the problem remains to be solved? Compaction or other totally different ways of solving the problem are the right way forward. There is an increasing demand for alternative materials that do not have that problem.