The map was published in 1951. BR dictated places of interest to Edith, who marked them on the map with numbers and letters which were identified in a list. See Sheila Turcon, "Richmond Park", Bertrand Russell Society Bulletin, Dec. 2022, pp. 4–7.

Until 1955 the Russells lived on Queen's Road, Richmond. Edith used a fountain pen to mark the map. Although she may have continued to use one after the move to North Wales, this fact and the map's publication date strengthen the likelihood of the view that the markings were made on a visit to Richmond Park from Queen's Road.