mm I don't have a shelf for house hobby books, alas. James Wong has always been a favorite television presenter of mine, first discovering him through the "Grow Your Own Drugs" show in the mid-aughts, and his twitter @botanygeek is delightful (he does excellent work engaging with food snobs into vague natural woo with facts).
As for the book itself- like the cookbooks I read, not something I'm going to immediately put into practice (it's difficult to plant a tree ready for harvest in ten years when in a second story apartment...) but James' thoughts are well-researched, with an 18 page PDF on his website of scientific literature references. This book isn't dry, though, distilling stats and numbers into easy to follow instructions.
My issues with this book are editorial- there are a handful of typos (in one case, I think captions were switched for two varieties of fig) and some of the "See x on page y" things early on led to the wrong place. I suspect this might've happened in the transition from UK to NA publication, but can't confirm unless I look at a British edition. Because this was originally aimed at a British audience, some of the plants assumed to be common might not be as readily available, but a very full list of seed purveyors in Canada and United States is included right before the index.