I received my copy last week and have read it from cover to cover. A splendid book, evidently very thoroughly researched and a good summary of salient points taken from a vast range of official sources with little anecdotes added here and there, which add much interest.
There is much in the text that is highly technical, which is good to see, and though informative, descriptions of how the electrical and power systems in general work require a degree of knowledge of power engineering to understand them fully (anyone who has read the previous Southern Way book on the SR booster locomotives will probably have experienced this).
A splendid collection of photographs, too… though as a 'green era' modeller, I would have liked more of the early days of the HA class: well, I would say that, wouldn't I? Perhaps they simply do not exist.
As others have said, it is a book that all interested should add to their collection - and at such a reasonable price, too.
Well done, and thank you to both authors.