Tony Blair has demanded an end to agricultural export subsidies in five years, warning on Monday that failure to make progress at world trade talks in December could be "fatal" for the Doha round.

The prime minister, writing in the Financial Times, sets out an agenda on Africa, climate change and trade with the developing world that he hopes will form the basis for a round of international summits as he enters the final phase of Britain's chairmanship of the G8 and European Union.