The deputy prime minister of the United Kingdom is the second highest ranking minister of the Crown and a member of the British Cabinet. The title is not always in use and prime ministers have been known to appoint informal deputies without the title of deputy prime minister. The incumbent deputy prime minister is Oliver Dowden who also serves as Chancellor of the Duchy of Lancaster and Secretary of State in the Cabinet Office.
Anthony Eden is often described as Winston Churchill's deputy, though his appointment as deputy prime minister in 1951 was actually rejected by the King.