Funding of the Sustainable Development Commission (SDC) will cease at the end of March 2011, and Defra's capability and presence to improve the sustainability of Government will be increased. Whilst regretting the Government's decision to stop funding the SDC, the Committee sees an opportunity to reassess and revitalise the architecture for delivering sustainable development. The experience of SDC's work within Government departments to improve their sustainability skills and performance is at risk of being lost, so the Government must ensure that this knowledge and expertise is absorbed by departments. Sustainable development needs to be driven from the centre of Government by a Minister and department with Whitehall-wide influence. They must be capable of holding all departments to account for their sustainable development performance. The Committee does not think Defra is best placed to lead this drive, and recommends that the Cabinet Office assume this role. And the Treasury could use its position to continue to develop 'sustainability reporting' by departments, strengthen the system of impact assessments and the 'Green Book' investment appraisal methodology for policy-making, and embed the results of the Government Economic Service review of the economics of sustainability and environmental valuation into those impact assessments and appraisals. Greater political leadership from the top should be brought to bear. The Government must introduce a full set of indicators to measure sustainable development that can be used to develop policy and must provide a new strategic underpinning for its commitment to sustainable development as an overarching goal of Government policy-making.