It has fast become an article of faith for the commentariat: while Labour was floundering under Jeremy Corbyn, Sadiq Khan showed the way with his pro-business, centrist campaign to win the London mayoralty. Yet the truth is almost the opposite. Labour’s performance in the 2016 London Assembly elections under Corbyn was the best of any party since the Assembly was created, and Khan’s personal vote when compared to his party’s result was the least impressive of any candidate ever to have won the mayoralty. His support was entirely in line with that of his party. He won because he stood for Labour.

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