The assault by European Union leaders also represents a defeat for President Barack Obama, who is desperate for other big economies to copy his $800 billion stimulus plan.

Adding to the disarray, a draft of the agreement Brown hopes to secure was leaked to a German news magazine, prompting suggestions of “dirty tricks” by Berlin.

The draft stated that Britain wanted a “$2 trillion” global fiscal stimulus. However, the figure appeared only in brackets, indicating agreement on the package had yet to be reached.

The stimulus would boost world growth by 2% and employment by 19m, the draft said. The rest of the document was mainly general pledges.

“We believe that an open world economy, based on the principles of the market, effective regulation and strong global institutions, can ensure sustainable globalisation with rising well-being for all,” it said.