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We look at the money that's oiling the wheels of Islamic State's military machine. It takes a good deal of smuggled oil to fuel the tanks and humvees rumbling across northern Iraq and Syria. We hear from Dr Val茅rie Marcel, associate fellow at the thinktank Chatham House, on what those fighting IS can do to turn off the taps?

Also in the programme, why is the global art market set once again to beat all records this year? We hear from Ryan Gander, a British modern artist at London's leading art fair, and from art dealer Dominique Levy. And, how smart is your boss? Lucy Kellaway of the Financial Times wonders whether the most talented graduates rarely stick around at big institutions, they strike out on their own leaving only the mediocre behind to run the world's biggest businesses.