Roman Abramovich may owe HMRC £1bn for unpaid taxes, analysis shows

Exclusive: Leaked papers suggest billionaire's overseas firms should have paid UK tax on profits from hedge funds

Roman Abramovich, the billionaire Russian oligarch, may owe British tax authorities as much as 1bn, according to analysis of documents that suggests his companies failed to pay tax on profits made through an elaborate offshore investment scheme.

Leaked papers and court filings shed new light on how the income from a $6bn (4.8bn) cash pile amassed by one of the world's richest men was managed.