Britain told its European Union partners yesterday the EU’s treaties were “not fit for purpose” and there must be reform or it would quit the bloc.

In the latest blast of euroscepticism from Conservatives in Britain’s coalition government, Chancellor George Osborne said EU treaties had to be changed to protect member states like his own that don’t use the euro.

The comments, made at a conference in London on reform of the 28-nation EU, are unlikely to be embraced by integrationists in Brussels, who want Britain to remain in the bloc but have become irritated by its demands for change.

Such countries have a narrow chauvinistic idea of the protection of their interests

Jose Manuel Barroso, the president of the European Commission, accused countries like Britain that have questioned the bloc’s freedom of movement rules of having a “narrow, chauvinistic idea of the protection” of their interests – an indication of how tough London may find it to win allies.

Osborne, a close ally of Prime Minister David Cameron, said the treaties that governed how the EU was run were “not fit for purpose” and had to be overhauled.

“Proper legal protection for the rights of non-euro members is... absolutely necessary to preserve the single market and make it possible for Britain to remain in the EU,” he said.

“If we cannot protect the collective interests of non-euro zone member states then they will have to choose between joining the euro, which the UK will not do, or leaving the EU.”

A drive for closer integration among the 18 countries that use the single currency was straining the EU’s institutional architecture, he said, a situation he said risked “going beyond what was legally possible or politically sustainable”. Britain’s Conservatives have long been sceptical about European integration. But their rhetoric is becoming stronger as they face a challenge in May’s European Parliament elections and beyond from the UK Independence Party, a primarily right-wing group that wants Britain to leave the EU.

Cameron has promised that if he is re-elected in 2015 he will try to renegotiate Britain’s EU ties before offering Britons an in/out referendum on membership.

The pledge, made last year, was partly designed to pacify his party’s MPs whose vocal desire to leave the EU or radically dilute its influence over British life risked tearing the party apart and under-mining Cameron.

It was a strategy that worked for a while, but the same eurosceptics have now begun to demand Cameron do more to counter what they see as the EU’s perni- cious influence.

In comments that looked designed to placate them, Osborne said he and Cameron were determined to make good on their EU promises. “Our determination is clear: to deliver the reform and then let the people decide,” he said.

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