Potential changes the rich are preparing for, if Corbyn comes to power, include Labour’s desire to increase income taxes for anyone earning more than 80,000 pounds (US$97,600) and a possible wealth tax.

A report commissioned by the party called this year for higher taxes on empty homes, honing in on the luxury apartments left vacant in London’s glitzy Knightsbridge district put on the market for more than US$100 million. It also recommended reforming inheritance tax laws and an extra levy on real estate owned by foreigners, potentially hitting scores of billionaires, including Zara founder Amancio Ortega.

A wealth tax would need to take into account where someone lives as salaries and living costs are higher around London, according to Mark Davies, a London-based tax adviser to rich individuals. “There’s a massive discrepancy from the southeast to other parts,” he said. “Everything is being looked at from a single nation point of view, but the reality is there’s a difference in where you live.”

Financial secrecy could also be hard to come by under a Corbyn-led Labour government.

In a report on tax transparency published two years ago, the party called for individuals earning more than 1 million pounds a year to file tax returns publicly. It also raised the prospect of a public ownership register for trusts and all company shareholders, going further than existing measures that require disclosure of only major shareholders.

Data leaks from offshore law firms such as the one three years ago from Panama’s Mossack Fonseca could spur a Labour government to consider even greater financial transparency. Highlighting his personal interest in the matter, Shadow Chancellor John McDonnell queried the Conservative government’s progress last year on investigations into individuals exposed in the data leak.

Labour has also vowed to undo the privatisation of key industries undertaken by Margaret Thatcher, Conservative prime minister during the 1980s. Corbyn is committed to re-nationalising the energy, water, and rail sectors, as well as Royal Mail Plc. That could cost investors as the government may compensate stockholders on a book value basis rather than market value.

Virgin Trains, owned by billionaires Richard Branson and Brian Souter, has a UK rail franchise set to expire in the next six months, but the firm announced plans this year for a new service from 2021 between Liverpool and London.

Elsewhere, Labour plans to ask companies with more than 250 employees to direct 10 per cent of their equity shares to “inclusive-ownership funds” controlled by workers. And, the party has targeted property investors by embracing a policy to require them to sell homes to tenants at potentially below-market prices.

McDonnell sparked fears two years ago when he said the party was preparing for a possible run on the pound if it won power, raising the prospect of capital controls – restrictions on the movement of money – if Labour was elected. The shadow chancellor has since stressed that the party will not introduce such measures, but wealthy individuals have increasingly prepared to leave the UK, according to John Elder, founding partner of wealth advisory firm Family Office Advisors.

“Many of our clients come from jurisdictions where there’s been far-left regimes, like Brazil,” said Davies. “They say we know what this is: they tax the rich and essentially give away their money. It always reminds me of one of one of Margaret Thatcher’s favourite quotes: the trouble with socialism is that eventually you run out of other people’s money.”