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It has been an incredible few weeks for Jeremy Corbyn. Widely written-off by the political commentariat as a no-hoper when Theresa May called the snap election, he is now a prime minister in waiting, leader of the most popular party in Britain facing a weak and unstable government.

The pace of political events make September 2015, when Corbyn first won leadership of the Labour Party, seem like an age ago. But the foundation of his recent success was laid then — with a political vision that he deviated little from in the intervening two years.