If you own only one book on British country houses this probably isn't it, depending on what you're looking for. Most books like this, and I own quite a few, spend a few pages and up to several hundred words on each house, organized chronologically or by region. Sometimes they spend time covering developments over time in styles and function, but mostly they are building porn that show beautiful homes. These can be wonderful books. This book is not that.
Instead, this book describes the history of British country houses generally, detailing architectural trends, changing tastes and technologies, and the way that people lived in them, above and below stairs. The Country House is filled with beautiful photos, but they are illustrative of the concept being explained, not spreads showing multiple images inside and outside a particular house. Instead, for example, part of the book talks about kitchens and in that section it shows a variety of examples. In the area that talks about how libraries came to be de rigueur in these homes it shows a number of examples and describes how these evolved over time.
While other country house books touch on function, what it was (or rarely is) like to actually live in these things, this book dives deep. There is far more text than in a typical coffee table book, and that's a good thing. You kind of get the best of both worlds - very interesting explanatory prose and page after page of gorgeous photos.
If you already have books of pictures of your favorite British country houses and are looking for something more meaty, this one will be for you.
Highly recommended for anyone with an interest in the subject.