Predictably, Peter Mandelson's return to the centre of the political stage has ended in crisis. Mandelson's influence on Keir Starmer grew after Labour lost the Hartlepool by-election in the early days of Starmer's leadership. The fashionable narrative is that Starmer changed his strategy for the better after Hartlepool, but is that when the seeds were sown that have led to the current crisis around his leadership?

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What are the lessons of the Mandelson saga?