The first edition of the encyclopaedia was compiled over a number of years by antiquarian bookseller Ben Weinreb and by the historian Christopher Hibbert and was subsequently revised in 1993, 1995, and 2008. It has around 5,000 articles, supported by two indices - one general and one listing people, each of about 10,000 entries - and is published by Macmillan.
In 2012, an app was developed by Heuristic-Media, and released as London--A City Through Time. Toby Evetts and Simon Reeves, partners in Heuristic-Media, discussed the development of the app with The Guardian in 2013, describing how 4,500 entries had to be plotted onto a guide map by hand.
The encyclopaedia builds on a number of earlier publications, including: