This book opens with an exposition of the background to the introduction of the XK140, a key model because the XK120 was such a hard act to follow. Then comes a full technical analysis of the new car, covering all aspects of the chassis, running gear, engine and transmission, along with descriptions of the body types offered. This sets the scene for the subsequent coverage of the XK150. Major production changes during the evolution of the two models are recorded, and production and sales worldwide are analysed in depth. The author also provides information on prototypes, special-bodied cars, famous cars and famous owners. Appendices include advice on identification and dating, and unprecedented detail on colour schemes.