Fighting talk from UK PM. Photo: ReutersFighting talk from UK PM. Photo: Reuters

British Prime Minister David Cameron said his renegotiation of Britain's ties with the European Union was “bloody hard work” and refused to rule out campaigning for a British exit in a referendum if other EU leaders failed to grant him concessions.

As the Conservative Party gathered for an annual meeting, Cameron urged his party to be patient over Britain's relationship with Europe ahead of a vote on membership which he has promised by the end of 2017.

“If I don't get what I want, then I rule nothing out,” Cameron told BBC television when asked if he was prepared to lead Britain out of the bloc.

“But I am confident we will get what we need,” he said in Manchester, where arguments over whether Britain's should remain an EU member have overshadowed domestic announcements such as paid time off for older workers to look after grandchildren.

For at least a generation, Cameron's party has been riven by a conflict over Britain's relationship with Europe that contributed to the downfall of both Margaret Thatcher and John Major, the last two Conservative prime ministers.

When asked if Britain was drifting towards the EU exit, Cameron said: “I am trying to get for Britain the things that we need and obviously once I have got them I will turn around and make the case for staying in a reformed Europe.”

If I don’t get what I want, I rule nothing out

Under pressure from politicians who feared the electoral success of the UK Independence Party, Cameron in 2013 promised to hold a referendum, though UKIP won just one seat in this year's parliamentary election and Cameron won the first Conservative outright majority since 1992. Thousands of protesters against spending cuts are expected to march past the Conservative conference, and one opponent screamed “Tory scum” as members entered the venue

While Cameron's majority gives him authority with many supporters, the risk he faces is that the Greek and migrant crises in Europe turn public opinion against membership just as arguments over Europe fracture his own party.

A British exit would shake the union to its core by shunting the bloc's second largest economy away from a club it joined in 1973. Major investors and allies say a divorce would torpedo Britain's global clout and hurt London's financial powerhouse.

Details on the course of Cameron's negotiations with European leaders including German Chancellor Angela Merkel are closely guarded but officials said details on the outline of a possible deal could be given in December.

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