Sanctioned Russian oligarch Roman Abramovich could owe the UK up to £1bn after a botched attempt to avoid tax on hedge fund investments, evidence seen by the BBC suggests.
Leaked papers reveal investments worth $6bn (£4.7bn) were routed through companies in the British Virgin Islands (BVI). But evidence suggests they were managed from the UK, so should have been taxed there.
Some of the money that funded Chelsea FC when Mr Abramovich owned it can be traced back to companies involved in the scheme, the BBC and the Bureau of Investigative Journalism (TBIJ) also found.
The oligarch's lawyers said he "always obtained independent expert professional tax and legal advice" and "acted in accordance with that advice".