Kevin Green, Chief Executive of the Recruitment and Employment Confederation, told ITV News: "In reality we can't see any other benefits to the NHS other than avoiding tax."
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The talks descended into crisis on Friday when Canada's trade minister Chrystia Freeland walked out of meetings.
Police in New York are still investigating what the substance is and whether it could be harmful.
The Sherlock actor made the comment while he received an award for his humanitarian work.