Cross-party group on tax calls for HMRC to act after Guardian investigation finds former Chelsea owner may owe up to £1bn

• Roman Abramovich may owe HMRC £1bn, analysis shows
• Revealed: how Abramovich dodged taxes on his fleet of superyachts

The government and HM Revenue and Customs should urgently examine whether Roman Abramovich owes British tax authorities up to £1bn, more than 40 MPs and peers have said, after an investigation by the Guardian and media partners found that his companies may have failed to pay tax on profits from an elaborate offshore investment scheme.

The intervention, from both Conservative and Labour MPs, comes after leaked papers and court filings shed new light on how the income from a $6bn (£4.8bn) cash pile amassed by the former Chelsea FC owner was managed.