Horse bus driver badges 1838 to 1920c.
Motor bus driver badges from 1897 to 1991. Also including 'Composite badges' 1909 to 1931.
Conductor badges from 1838 to 1980.
Tram & Trolleybus Driver & Conductor badges.
Oddities of the licencing system.
From A to T where post 1931 badges were issued.
Outside of London badges were issued locally pre 1931.
Similar but different, Hackney licences - an initial attempt to list them in chronological order.