Labour MP David Winnick drew sharp criticism from members of the Conservative benches after accusing Thatcher of treating millions with "brutal contempt."
In a special sitting of the House of Commons to pay tribute to the Baroness who died in the Ritz on Monday, he said it would be hypocritical not to point out the "human cost" of her policies and the immense pain and suffering they caused.
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It had been reported that four domain names which appeared to support Clive Lewis for Labour leader were registered in June last year.
The EU flag symbolises unity between European countries.