Keir Starmer’s premiership is facing its most dangerous moment yet.

In this episode of Whitehall Sources, Calum Macdonald and political strategist Jo Tanner are joined by former No.10 Director of Communications Guto Harri to break down the political firestorm surrounding Peter Mandelson, the release of potentially 100,000 government documents, and the growing pressure inside Labour for heads to roll.

Starmer has apologised for “believing Mandelson’s lies” during the vetting process for his appointment as US Ambassador — but did that admission make things worse? Is Morgan McSweeney now the only “sacrificial lamb” left? And what actually happens inside Downing Street when a Prime Minister is under siege?

Guto takes us behind the black door of No.10 to explain:

The bunker mentality that forms in political crises

How leadership collapses really unfold

Why losing senior advisers can be fatal

The psychological toll of governing under scandal

We also explore whether this is just another Westminster storm — or the moment that could define (or end) Starmer’s leadership.

Is this Labour’s Partygate moment? Or something bigger?

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