Back to Posterioo

Chris Mason: The anatomy of the prime minister’s downfall

There’s a particular silence that descends on Downing Street when a prime minister stops being believed. Not disliked, not unpopular, but genuinely, irreversibly disbelieved. Sir Keir Starmer has reached that silence.

It didn’t happen overnight, and it didn’t happen because of one bad PMQs or a single policy U-turn. It happened the way political authority always collapses: gradually, then suddenly. The same pattern swallowed Boris Johnson whole, then Liz Truss in just 45 days. Now, according to BBC political editor Chris Mason, it’s swallowed Starmer too.

The diagnosis is clinical. A prime minister, Mason argues, loses the capacity to “viably govern” not merely when they lose votes in the Commons, but when their own party stops defending them in the green rooms and the WhatsApp groups. When cabinet ministers begin carefully distancing their language. When the loyalty becomes performative.

“The moment a leader’s authority becomes conditional,” one senior Labour source told colleagues privately, “it’s already gone.”

Starmer came in promising a reset after the chaos of the Johnson and Truss years. He had a majority of 174, the largest Labour had held since 2001. It felt, briefly, unassailable. Fourteen months later, that majority looks less like a fortress and more like a number on a spreadsheet nobody quite trusts anymore.

The specific grievances have piled up: the winter fuel payment cut that alienated pensioners and backbenchers alike, a stuttering growth agenda, and a communication style that critics describe as forensic to the point of bloodlessness. You can win every argument and still lose the room.

Johnson survived scandal after scandal before the letters finally came. Truss didn’t survive her own budget by three weeks. Starmer’s trajectory sits somewhere between the two, which in some ways makes it harder to read, and harder to stop.

What’s striking is how familiar the architecture of collapse now feels. The same structural cracks, the same gravitational pull toward the exit. Westminster has seen this film before, and it doesn’t tend to end differently in the third act.

The question isn’t whether Starmer can recover his authority. It’s whether anyone in his own party still believes he can.

All articles