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Tax avoidance 'costs UK billions'

21 November 2012 Last updated at 07:31 GMT

The inability of HM Revenue and Customs (HMRC) to properly curb aggressive tax avoidance schemes is costing the UK billions of pounds, a report suggests.

The National Audit Office said HMRC was dealing with a backlog of 41,000 cases involving individuals and small companies, with up to £10.2bn at stake.

Vicki Young reports.