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He added: "Further information cannot be provided at this stage as our investigation is ongoing."
Both the Crown Prosecution Service and HMRC – which investigates cases before referring criminal files to the CPS – have pledged to increase the number of prosecutions over tax fraud, as they try to rein in the £14 billion a year that the economy loses from tax evasion. HMRC's prosecution office was merged into the CPS in 2010.
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In January, the CPS said it would dramatically ramp up the number of tax-evasion cases it took on with a view to prosecution over the next two years. It said it would increase fivefold the number of tax files it handles, to 1,500 a year by 2014-15. This compares with 200 tax convictions the CPS secured in 2010. Its current conviction rate for tax cases stands at 86 per cent.
HMRC has traditionally been wary of the high costs of bringing cases, as well as the difficulty of convincing juries in complex cases. But it has faced pressure to take more tax cases to court, amid fears that a steady decline in prosecutions is eroding the deterrence of fraud and evasion.