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The prospect before the Labour Party has changed very dramatically since the start of the year. Instead of a hard but manageable slog to overtake the Conservatives as Britain’s largest party at the next general election, Labour politicians now contemplate a dismal scene of long-term exclusion from government: from the government, that is, of the rump UK, minus Scotland. The reason is that David Cameron, attempting to outflank the SNP during a midwinter silly season offensive, has managed to provoke Scotland’s first minister, Alex Salmond, into a daring dash for independence.