I apologise to the hon. Gentleman; he did raise the issue earlier. I made a note of it and failed to respond to my own note. The definition of biodegradability does not change. I think that the hon. Gentleman is asking about the nature of biodegradable waste and the trends in it. The main components of municipal waste are paper, cans, glass, textiles and disposable nappies. Trends develop over time, but I do not have the information to hand. However, I will endeavour to collect it and make a statement at the beginning of the next sitting on 29 April.