Quite simply, the Jaguar XK Explored series, authored and lavishly illustrated by the great Jaguar enthusiast, Bernard Viart, is the most useful printed resource available for the XK Jaguar restorer, bar none. No arguments.
This thick second-edition volume, comprising 407 full-color pages and featuring 2600 original drawings, covers the details of construction, part numbers, wiring colors, factory options and tools, in exhaustive detail. Viart spent hundreds of hours examining original cars, photographing details and then transferring them to a drawing program where the pictures were editing, enhanced and annotated extensively, using the author's vast knowledge of Jaguar part numbers, supersessions and changes made during the model run.
We cannot say enough to praise Jaguar XK120 Explored. If you own a 120, you should own a copy of this book, which is in its second printing, but they are nearly sold out worldwide, so you should act fast if you want one. We have a very limited supply, and when they are gone, we will probably not be able to get more for a very long time.
We use our copies of this book, along with the XK140 and 150 companion volumes (which are, sadly out of print at the moment), every single day.