How will war in the Middle East affect energy prices?

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Shipping has ground to a halt in the gulf after Iran limited access to the Strait of Hormuz. But its the effect on energy prices that's being felt around the world. Prices have soared as a fifth of the world's oil and liquified natural gas goes through that narrow channel. The World At One's Sarah Montague and PM's Evan Davis discuss just how big an effect it's having. Image credit: BBC