Londonist does a good job introducing us to two maps of old London published by the Historic Towns Trust a few years ago—a map of medieval London (1270-1300) published in 2019, and a map of Tudor London (1520) published in 2018 (and updated in 2022). The Historic Towns Trust publishes many maps of British towns and cities—historical maps, not reproductions of old maps (in fact, Londonist points out that no maps of London prior to about 1550 currently exist). The Trust’s London maps are also available as overlays on the Layers of London online map: Tudor, medieval. Some maps from the Trust’s British Historic Towns Atlas, which began publishing in 1969 and the earliest volumes of which are out of print, are also available as PDF downloads; here’s the page for London.