British Library, holds various LEO related items in its archives. Including oral
Histories of Mary Coombs and Frank Land. BL also maintains an archive of selected
patent application including LEO patents lodged by John Pinkerton. See BL Explore
Archives and Manuscripts catalogue. The catalogue number is Add MS 89294
http://searcharchives.bl.uk/IAMS_VU2:IAMS032-003391654
https://discovery.nationalarchives.gov.uk/details/r/C18119
