Den Carlow grew up with a Jaguar Mark X, he has been an archive volunteer at the Jaguar Daimler Heritage Trust for over 25 years, and has written a number of papers on various Jaguars which have been published by the Trust. Using original records in the Trust archive as well as published sources, he and Penny Woodley undertook most of the research which has provided many new insights and much new information on the cars described in this book. Den is a keen collector of Jaguar books and publications, as well as scale models. Anders Ditlev Clausager spent most of his working life of 35 years as an archivist, first with the British Motor Industry Heritage Trust, and then the Jaguar Daimler Heritage Trust, until retirement in 2014. During his years with the JDHT he became thoroughly familiar with the cars included in the present volume. He is a general automotive historian with about twenty books to his credit, including titles on Jaguar XK 120, XK 140, and E-type, and in 2017 won the Cugnot, Montagu, and Sedgwick awards for his book on Wolseley. Paul Skilleter has spent more than 50 years researching and writing about Jaguar cars. He was a founder of the Jaguar Drivers' Club's XK Register and his first book Jaguar Sports Cars was published in 1975. His Jaguar Saloon Cars won the Cugnot award in 1981. He has edited the XK Bulletin and Jaguar Driver, and has founded several magazines, including Jaguar Quarterly which became Jaguar World, but also Practical Classics. He continues to write, and runs a private publishing company, which naturally specialises in Jaguar titles! Penny Woodley has a unique insight in some of the cars discussed in this book, since she and her late husband Roger Woodley used to own four of them, inherited from her father Guy Griffiths who established a small private motor museum at Chipping Campden. Although all these cars have since passed into other ownership, Penny remains an enthusiast and is a long-standing archive volunteer at the JDHT. Working together with Den Carlow, she has put together much of the detailed information in the individual car histories in this book.