ABSTRACT
The City of London has always been a defined and contained territory which has required defending at various stages in history, for instance against crime or intrusion or, against economic competitors. The response to the terrorist threat since the early 1990s, combined with the need to remain competitive in the global economy commenced the most recent example of this trend. Following a brief introduction to the built form of the City, this chapter will chart the physical changes to the urban landscape, and the associated strategies employed by the agents of security, primarily the City of London police, that were developed in the Square Mile as a result of the terrorist threat in the 1990s and early Twenty-first century.
