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The influential House of Commons Public Accounts Committee has described Google's explanation of its tax arrangements as "deeply unconvincing".
The Internet giant pays no corporation tax in the UK because, it says, sales take place in Ireland, where taxes are lower.
This report is by ITV News Business Editor Laura Kuenssberg:
Speaking to ITV News, Chief Executive of Sainsbury's Justin King says there is a big debate to be had about "levelling the playing field" for tax between high street retailers and those that operate solely online.
The chair of the House of Commons Public Accounts Committee has said that she thought Google UK boss Matt Brittin's appearance before MPs was "completely unconvincing".
Margaret Hodge also said it was clear from investigative journalism by Reuters and evidence from whistleblowers that most of the company's sales were generated in the UK rather than Ireland.
In May, MPs accused Google UK boss Matt Brittin of "calculated and unethical behaviour in deliberately manipulating the reality" of the tech giant's business for tax avoidance purposes.
In response, Mr Brittin denied the accusation and insisted: "We comply fully with the laws that are set down by politicians. Tax is not a matter of choice, tax is a matter of following the law."
Latest ITV News reports
Writing for ITV News, Richard Murphy, one of the founders of the Tax Justice Network, says Google is using the law to its advantage.
In a strongly worded report the Public Accounts Committee criticises Google for the way the internet company legally reduces its tax bill.