Midland General; 1920-1971; Bus company based in Alfreton. Became part of Trent Motor Traction in 1971.
Nottinghamshire and Derbyshire Traction; 1903-1953; Bus company running services between Ripley and Nottingham, originally by tram. Merged with Midland General in 1953.
Harpur Crewe family of Calke