Keir Starmer's resignation will dominate the headlines, and Westminster will obsess over his successor, the prospect of an early general election and what it all means for the parties.

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But those who only focus on who comes next are missing a large part of the picture. The hard truth, and one that Westminster refuses to confront, is that changing the occupant of Number 10 changes very little if the machine they are trying to operate remains broken.

I spent over a decade inside that Whitehall machine as a Foreign Office diplomat. I watched my fair share of prime ministers come and go, but the internal dysfunction of the machine continued unabated. It was structural, cultural, and stubbornly resistant to whoever held the prime ministerial red box. Which is why,........

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