The Cabinet Office is a department of the Government of the United Kingdom responsible for supporting the prime minister and Cabinet of the United Kingdom. It is composed of various units that support Cabinet committees and which co-ordinate the delivery of government objectives via other departments. It currently has just under 8,000 staff, most of whom are civil servants, some of whom work in Whitehall. Staff working in the Prime Minister's Office are part of the Cabinet Office. 2022.