Equity is not an easy topic to grasp, and I have no doubt that the author is well versed in the field. However, while Hanbury & Martin might serve as adequate reference material to those already familiar with the subject, those looking for a point of entry into the subject should avoid purchasing this book.
Martin utilizes a dense and often confusing style of writing, riddled with awkward syntax and long run-on sentences that require unnecessary energy to unpack. Conclusions are alluded to rather than clearly stated, further obfuscating an already difficult subject. While I understand that the editing standards of academic textbooks tend to be more lax as compared to other print media, the standard of writing in this book is simply dreadful.
Even more annoying is the author's tendency to refer to cases or concepts tens or hundreds of pages before actually explaining them. While this isn't a problem if one is already familiar with the subject matter, it only serves to frustrate those studying the subject for the first time.
Lastly, sticking an anonymous amazon review on the back of a book is incredibly tacky.
Considering that there are better alternatives out there (Petit is more detailed, Hudson is more readable), I suggest seeking them out before making this purchase.