The Cabinet Office is a ministerial department and senior decision-making office of the Government of the United Kingdom, responsible for supporting the prime minister and Cabinet. The Cabinet Office is also the corporate headquarters of the British Civil Service and it is composed of various units that support Cabinet committees and coordinate the delivery of government objectives via other departments. As of March 2026, it had more than 5,385 staff, mostly civil servants, many of whom work in Whitehall and Canary Wharf. Staff working in the Prime Minister's Office, 10 Downing Street, are part of the Cabinet Office.
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