This paper draws on experience and reviews of the 2005/6, 2006/7 and 2007/8 programmes, and on emerging experience with the 2008/9 programme. It describes the main elements of the programme, the way that different aspects of these have changed as lessons have been learnt and new challenges faced, the achievements of the programme, and the challenges and opportunities there are in seeking to improve its effectiveness, efficiency and sustainability. It was originally prepared in December 2008. This June 2009 revision updates information for the 2008/9 programme where it is available. 2008/9 programme benefit:cost estimates have been removed and have not been updated as there are some uncertainties regarding programme costs, and to present estimates at this time without first resolving these uncertainties will add little to the earlier analysis and is likely to be misleading.