The Centre for Local Economic Strategies (CLES) has set out ten considerations to ensure greater effectiveness from the goods and services procured by the public sector. CLES also calls on central government to recognise the potential of public procurement in the future vibrancy of our economy and in enabling local economic, social and environmental benefit:
http://www.cles.org.uk/wp-content/uploads/2013/08/CLES-10-Maximising-the-benefit-of-procurement.pdf