And he is disarmingly candid when talking about the challenges of running a group with interests ranging from chrome and zinc to copper and coal. The best-laid plans can be derailed by the vagaries of the commodities and currency markets. Yes, the company can try to hedge against currency movements, but that doesn't always work. Xstrata, a £3 billion FTSE 100 company, bet on the rand falling - in fact, it has shot up. 'We were obviously wrong,' admits Davis.