• Duple Motor Bodies Ltd: 1919-1989
  
  
• Hall Lewis (Off site history)
  Part of the Park Royal site - containing many historic photos of Hall Lewis bodied vehicles.
  
  
• W. L. Thurgood: 1925-1967
  
  
• Park Royal Vehicles: (Off site history)
  Well illustrated site about PRV and its predecessor Hall Lewis by Graham Hill - son of Alfred Charles Hill who started his career at Hall Lewis (predecessor of PRV). Contains many historic B&W photos.
  
  
• Park Royal Vehicles 1930-1980 (On this site)
  Brief history courtesy Graham Hill.

Chassis Makers

• The Associated Equipment Company Ltd: 1912-1979
   
• Atkinson Vehicles Ltd: 1950-1963
   
• Gilford Motor Company Ltd: 1926-1933
   
• Guy Motors Ltd: 1914-1986
   
• Karrier Motors Ltd: 1908-1946
   
• The Leyland Story: Part 1: 1896-1946
• The Leyland Story: Part 2: 1946-1991
   
• M. G. Rowe (Motors) Doublebois Ltd: 1953-1958