With some high-end properties in and around London running at the tens of millions of dollars, the city is well-placed to launder illicit funds or park money that is being hidden from tax authorities. In fact, British officials estimate that around $173 billion in laundered money entering the country every year is whitewashed via bricks and mortar — with much of it ending up in the country’s capital.

… Why do so many of the world’s super-rich park their cash in London? Because it’s easy and it works, according to Borisovich.

“This is a place where a company can come, buy a luxurious piece of property, and just put down the name of its director without telling us who is behind it,” he said.

… Why do so many of the world’s super-rich park their cash in London? Because it’s easy and it works, according to Borisovich.

“This is a place where a company can come, buy a luxurious piece of property, and just put down the name of its director without telling us who is behind it,” he said.

“Everything else helps in London as well … I mean this is the best ownership legislation, robust, tested, it’s a cultural center, education center. But first and foremost is the ease with which dirty money can come here and anonymously buy anything,” he added.

The kleptocracy tour debuted in February before the revelations of the Panama Papers — a trove of leaked documents that shed light on a network of law firms and banks that offer financial secrecy and investments in low-tax regimes.

Growing interest in the tour’s outings feeds on the perception that many of the world’s richest are avoiding paying their fair due in taxes.

According to watchdog Group Transparency International, companies based in British territories overseas —former British colonies — own 36,000 homes in London.

“Were all those houses bought using illicit money? Probably not, but the rules create an environment where the corrupt can easily hide,” said Rachel Davies, the group’s head of U.K. advocacy and research.

Activists like Davies have long said that it is hard to get the government to take notice of loopholes in the U.K. ownership laws. That may get easier in the wake of the Panama Papers.

“What’s striking about the Panama Papers is the fact that it really blew the lid off the U.K. being involved in these issues,” she said. “Half of the companies involved in the Panama Papers are based in British overseas territories, almost 2,000 of the professional enablers, accountants, [real] estate agents, that were working with the Panama firm were based in the U.K.”