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The Prime Minister’s Office (PMO) of the United Kingdom is the executive office supporting the Prime Minister in leading the government. Located at 10 Downing Street, London, it coordinates policy development, manages government communications, and oversees political and parliamentary affairs. The PMO has evolved over time, notably under Prime Minister Tony Blair in 2001, when it was reorganized into three directorates: Policy and Government, Communication and Strategy, and Government and Political Relations. This restructuring aimed to strengthen the PMO's capacity to drive change across government departments and improve coordination. In recent years, discussions have arisen about the size and structure of the PMO, with some reports suggesting that its expansion may require further structural support to effectively manage its responsibilities.