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Like many of Europe\u2019s long-established parties of the left, the UK Labour Party is in big trouble. In last December\u2019s election, Labour wasn\u2019t just beaten, it was humiliated, losing its grip on working-class heartlands in the midlands and the North. Stephen Sackur interviews Len McCluskey, who will have a big say in the choice of the party\u2019s next leader. He leads the Unite Union, which is Labour\u2019s biggest financial backer. Who can save Labour from a slow death?