Absolutely Brilliant and Essential,
It can certainly be complemented by other books. The two that I chose and am very pleased with are the Original MGB with MGC and MGB GT V8 by Anders Ditlev Clausager, and the Haynes Restoration Manual MGB (2nd Edition). The first is NOT a restoration manual as it advertises itself to be. It is more like a coffee table book, a showroom “this is what perfect looks like” book. The second, by Lindsay Porter, is a really superior piece of work that brings complex photographic illustrations, detailed descriptions, and context. See my separate reviews of these latter two books. All three are essential.
The value of this book, the original MGB 19962-1980 guide, apart from its substance, is how well is conveys the idea that the MGB, the last and only car I have every been able to understand, was in fact intended as a racing sports car that could be both maintained and restored by its owner.