Tony Blair...is expected to announce measures intended to ensure that the £150bn the government spends each year goes on goods and services that meet certain "green" standards. The standards will cover energy efficiency, greenhouse gas emissions, the efficient use of natural re-sources and raw materials, transport, measures to avoid pollution and ways of ensuring environmentally sensitive goods such as timber are obtained from well-managed sources...A group of more than 12 big businesses is also planning to write an open letter to Mr Blair welcoming his plans next week. These include BT, Skanska, Legal & General, Hewlett-Packard, EDF Energy, Carillion, KPMG, British Land, Biffa and Royal Mail...But David Frost, director- general of the British Chambers of Commerce, said yesterday: "Small businesses are already switched on to the benefits of sustainability and they don't need yet more regulation and red tape to tie themselves in knots getting government work.