£27,700 million - Steel

With his vast wealth, Mittal is worth more than the previous three entrants on this list combined. While retaining an Indian passport, Mittal spends much of his time in London.

Along with running the world's biggest steel company, he wants to buy out his brother's steel plant in Bulgaria. He's also a shareholder in Queens Park Rangers which help to make the London football club the richest in the world in terms of ownership.