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The General Secretary of the Unite union Len McCluskey has told 5 live his union could disaffiliate from the Labour party if Ed Miliband fails to embrace radical policies and loses the next General Election.

The next 16 months are "a real watershed moment", Mr McCluskey said.

"The question would be is Labour still the party that represents us."

The leader of Britain's largest union was speaking to 5 live's Chief Political Correspondent John Pienaar.