Keir Starmer has resigned as prime minister following record local election losses and a significant by-election defeat for the Labour Party. His departure triggers a leadership contest to address the government's declining popularity and internal pressures regarding defense spending and electoral strategy.

Summary based on The Independent article

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Sir Keir Starmer has announced his resignation as prime minister and will remain in office until a successor is chosen. The subsequent leadership contest will determine the next head of the UK government, with nominations expected to open in July and conclude by September.

Summary based on BBC News article