David and Simon Reuben

The Indian-born British industrialists have a net worth of £22.265 billion, which they have amassed through their vast real estate and internet empires. The brothers "grew up in squalor and were badly educated in a state school in Islington," according to The Sun. David and Simon Reuben, brothers, amassed a fortune in real estate and technology and are among the richest people in the UK. It sold 49 percent of its data center business, GlobalSwitch, to a group of Chinese investors for roughly $3 billion in December 2016. The brothers were born in Mumbai and raised in the United Kingdom, where David began his career dealing metals while Simon began his career importing carpets and purchasing real estate.

Before launching Trans-World Metals, they worked as carpet fitters and scrap metal collectors. The couple has "spent their fortune on a variety of boy's toys," according to the newspaper, "including a £54 million super yacht and a £20 million private plane."

Net worth: $20 Billion