When finance ministers from the G20 major economies meet next weekend, they could be excused for having a sickening feeling of deja vu. This time it's Paris, not London, but, just as in May 2009 when Gordon Brown brought the power-brokers of the world economy together in Docklands, they are trying to prevent a financial crisis spiralling out of control and dragging the global economy into recession. This time, though, there is far less political agreement or goodwill.