London has become the hottest destination for ultra-high-net-worth individuals (UHNWIs), with more than 80 billionaires currently living in the city. In fact, there are more billionaires in London than in any city in the world, and more than 80% of all billionaires in the United Kingdom live in London. The city's billionaires have a combined wealth of $497.6 billion and account for 59% of the total value of the U.K.'s top 1,000 wealthiest people.

By comparison, New York, the city with the second most billionaires, has a total of 56, while Paris comes in at third with 21 billionaires. San Francisco, Moscow, Hong Kong and Los Angeles each have between 40 and 50 billionaires.

Len Blavatnik

Len Blavatnik is the owner of Access Industries, a diversified portfolio of assets that consists of commodities, technology and media startups. Blavatnik was born in Ukraine and raised in Moscow before emigrating to the United States. He kept an interest in Russia and made some great investments in post-Soviet aluminum and energy companies. His biggest success came in 2013 when he sold a 12.5% stake in the Russian oil company TNK-BP to Rosneft for $7 billion.

In 2015, Blavatnik purchased U.K.-based media and sports analytics company Perform for more than $1 billion. Since then, he has kept a residence in the U.K. His current net worth is $18.8 billion.

Sri and Gopi Hinduja

Sri and Gopi Hinduja are two of the four brothers who own the Hinduja Group, a multinational conglomerate. The company operates as an investment business with holdings that include banking, transportation, energy, technology and media.

The company was started by the siblings' father, Parmanand Deepchand Hinduja, who traded goods in what is now Pakistan. He moved the company's headquarters to Iran in 1919, where the business stayed until his sons moved its headquarters to London. Currently, the business is co-chaired by Sri and Gopi, both of whom live in London. The combined net worth of the siblings is $15.4 billion.

Galen Weston

Galen Weston is the executive chairman of George Weston, a Canadian food and retail giant that was founded by his grandfather in 1882. Weston found early success by running the company's grocery stores in Ireland and was given the task to turn around the struggling supermarket chain Loblaws, which was owned by his father. He was able to save the business and maintains ownership today through his son, who currently oversees the company.

Weston also has majority control of Selfridges Group, a holding company that owns department stores Ogilvy's, Holt Renfrew, Brown Thomas and Selfridges. He and his wife have a current net worth of $9.6 billion.

Mark Scheinberg

Mark Scheinberg is a self-made billionaire who made his fortune in online poker. He helped build PokerStars, the world's biggest online poker company. The business was founded in 2001 and was first operated out of Costa Rica before moving operations to the Isle of Man. Scheinberg's parent company, Rational Group, also owned Full Tilt Poker and was sold to Amaya in 2014 for $4.9 billion.

Scheinberg was the largest shareholder of Rational Group and benefited from the rise in the popularity of poker in the U.S. He has a current net worth of $4.1 billion and is the 46th richest man in tech.

Teddy Sagi

Teddy Sagi is an Israeli billionaire who has lived in London for many years. He founded the gambling software company Playtech in 1999 and has helped build it into a business with $500 million in annual sales. The company trades on the London Stock Exchange and has a multibillion dollar valuation.

In addition to Playtech, Sagi has taken three other companies public: Market Tech, SafeCharge and Crossrider are all traded on the London Stock Exchange. He has a current net worth of $3.5 billion.