Book excerpt: Fronted by one of the world’s most iconic doors, 10 Downing Street is the home and office of the British Prime Minister and the heart of British politics. Steeped in both political and architectural history, this famed address was originally designed in the late seventeenth century as little more than a place of residence, with no foresight of the political significance the location would come to hold. As its role evolved, 10 Downing Street, now known simply as ‘Number 10,’ has required constant adaptation in order to accommodate the changing requirements of the premiership. Written by Number 10’s first ever ‘Researcher in Residence,’ with unprecedented access to people and papers, No. 10: The Geography of Power at Downing Street sheds new light on unexplored aspects of Prime Ministers’ lives. Jack Brown tells the story of the intimately entwined relationships between the house and its post-war residents, telling how each occupant’s use and modification of the building reveals their own values and approaches to the office of Prime Minister. The book reveals how and why Prime Ministers have stamped their personalities and philosophies upon Number 10 and how the building has directly affected the ability of some Prime Ministers to perform the role. Both fascinating and extremely revealing, No. 10 offers an intimate account of British political power and the building at its core. It is essential reading for anyone interested in the nature and history of British politics.