DAVID CAMERON was heckled yesterday as he told bosses he was ready to dive “headlong” into the campaign to keep Britain in the European Union.

The Prime Minister was interrupted as he as addressed the annual conference of big business lobbyists the CBI.

Two students were hauled out of the London event by security guards after holding up a banner reading: “CBI = voice of Brussels” and shouting the same slogan.

Mr Cameron blasted 19-year-olds Phil Sheppard and Peter Lyon for “making fools of yourselves.”

Mr Lyon described the experience as “terrifying” but insisted it had been “worthwhile” to highlight concerns over EU membership.

And Vote Leave, the group which set up a fake company to get the students into the hall, vowed more disruption of pro-EU events.

Spokesman Robert Oxley said: “We will be working together closely during the campaign to do more of these protests — particularly at the AGMs of big companies who try to scare the British people into voting to remain.”

Trade Unionists Against the EU staged a demonstration outside the conference, waving placards reading: “Say no to EU TTIP.”

Organiser Brian Denny said the trade deal with the US revealed the “corporate-dominated” nature of the EU.

“Trade unionists and their allies must understand that it is impossible to be against austerity and TTIP and support this country staying in the EU,” he said.

Mr Cameron told bosses earlier that he had no “emotional attachments” to Brussels, but said his preference was to “throw ourselves headlong into keeping Britain in a reformed Europe.”

The PM is due to formally lay out his renegotiation terms for the first time in a letter to European Council president Donald Tusk today.

TUC general secretary Frances O’Grady called on Mr Cameron to rule out any attack on workers’ rights as part of a deal.

She said: “The secrecy and delay surrounding the Prime Minister’s desperate attempts to appease his own party have created uncertainty for employers and worry for workers.

“He needs to open up about what it is he’s asking for in his renegotiation strategy.”