It was said of John Major, the Tory prime minister fatally damaged by party infighting, that he was “in office but not in power”. Sir Keir Starmer finds himself in a similar spot. His government is planning a king’s speech that contains ambitious proposals. But after Wednesday’s pomp and circumstance will come the real test: six days of Commons debate, then a vote that governments almost never lose. Almost. The last prime minister defeated on such an occasion was the Conservative Stanley Baldwin in 1924. He and his party were forced from office.

With ministers resigning and roughly 90 Labour MPs openly questioning Sir Keir’s leadership, this is no longer parliamentary theatre. There is now an open question as to whether he can command authority once the applause fades. Every amendment and rebellion will be scrutinised. A prime minister unable to command backbench loyalty struggles to define the........

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