NO10

NO10 refers to the Principal Private Secretary to the Prime Minister of the United Kingdom. This individual serves as the senior civil servant in the Prime Minister's Office at 10 Downing Street, the official residence and workplace of the UK Prime Minister. The role is one of significant influence and responsibility, acting as the primary link between the Prime Minister and the wider civil service.

The Principal Private Secretary manages the Prime Minister's private office, overseeing the flow of information and advice to the Prime Minister. They are responsible for ensuring that the Prime Minister's decisions are communicated effectively to government departments and for coordinating policy development and implementation. This often involves managing complex issues, mediating between different departments, and acting as a trusted advisor on a wide range of matters.

The position requires a deep understanding of government, policy, and political dynamics. The Principal Private Secretary typically has a long and distinguished career in the civil service before taking on this role. They are privy to highly sensitive information and play a crucial role in the day-to-day functioning of Her Majesty's Government. The holder of this post is appointed by the Prime Minister and is a key figure in maintaining the efficiency and effectiveness of the Prime Minister's office.