London Underground has a rich design heritage stretching back over 150 years. It is a defining part of what makes London a leading world city. Attention to detail has made its customer environments world renowned, yet there remain inconsistencies in the quality of its stations. In order to continue to innovate and inspire customers and staff, the London Underground Station Design Idiom sets the future look and feel of all stations across the Underground's vast and diverse network. London Underground spent 18 months working with Studio Egret West to develop the Idiom. The final document covers all of London Underground’s 270 stations, with guidelines for how to create ordered, comfortable, accessible and atmospheric stations that are integrated with commercial and community uses. It outlines a holistic approach that can be practically applied to any style of station and any size of project, from small-scale patch repairs to brand new stations.