"If stability does return, we need to look very carefully to see where the next big global shock might be coming from. And the energy market is one of the prime candidates we need to keep an eye on," said Andrew Sentance, a member of the Bank of England's Monetary Policy Committee.

Sentance also said rather than breaking the link between economic growth and greenhouse gas emissions, they appear to be becoming more closely correlated at the global level. He said this reflected the absence of a