I am arranging for a copy of the study requested to be placed in the House Library.
For question (a), I refer the hon. Member to the answer given to the hon. Member for Brentwood and Ongar (Mr. Pickles) on 14 January 2007, Official Report, column 871W.
For question (b), the timetable for evaluation of the pilot household waste incentive schemes (including those which have a charging element) will in turn be dependent on their start date. As can be seen in the Climate Change Bill, we have committed to report back to Parliament on each of the pilots and we will do so when we have gathered sufficiently robust evidence.