These shake-ups are not necessarily noticed by the public, but they matter to parties and Parliament.
It began badly with a bust up with his deputy, Angela Rayner, who was being moved from one of her roles - in charge of campaigns.
Remember, however, that Ms Rayner's position as deputy leader is an elected one, and even the suggestion of her losing part of her role had already provoked outrage.Whether it was settled in the end by an arm wrestle, a staring match, or screaming and shouting, the length of time it took created a massive vacuum - which Sir Keir's critics on the left of the party filled, almost with glee, to push him for a change in direction.
One of her supporters said: "On Friday Keir couldn't answer a simple question about what Labour's vision is, what our offer is and how we will win back the voters in our heartland seats.'Political test'
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