David Cameron was heckled by Eurosceptics as he pledged to throw himself “headlong” into the campaign to keep Britain in the EU if his renegotiation of membership terms succeeds.
As the Prime Minister delivered a speech to the CBI conference in London, two protesters stood up and chanted “Voice of Brussels”.
After telling them they were “making fools of yourselves”, Mr Cameron insisted he had “no emotional attachment” to the institutions of the EU.
He said he wanted to “debunk” the idea that the UK could not survive outside the union.
“The argument is not whether Britain could survive outside the EU – the argument is how are we going to be better off,” Mr Cameron said.
But the premier – who will set out his main reform demands in a letter to European Council president Donald Tusk on Tuesday – expressed hope that he and business leaders could throw themselves “headlong into keeping Britain in a reformed Europe” after a successful renegotiation.