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Keir Starmer announced his resignation as UK Labour Party leader on June 22, 2026

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Keir Starmer resigns as UK Labour Party leader, markets brace for rising borrowing costs.

This is the sixth time in roughly a decade that a sitting UK Prime Minister has left the job early.

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Summary

The sixth premature prime ministerial departure in a decade sends gilt yields climbing and the pound sliding as investors price in political uncertainty. Keir Starmer announced his resignation as UK Labour Party leader on June 22, 2026, stepping down as Prime Minister and triggering what markets are treating as yet another bout of British political instability. Starmer communicated his decision to King Charles III and asked Labour’s National Executive Committee to arrange a leadership contest. Nominations for the leadership race begin on July 9, with a new leader expected to be in place before Parliament reconvenes in September.

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