If you want to improve your garden while maintaining organic practice and common sense, you will love this book. It is unique: although I've seen some of the advice within elsewhere, I've never been told WHY you are supposed to do these things. Until now.
Here is an example: I read elsewhere that when you plant a tree, you should not add compost or manure. Why? Flowerdew explains: you want the tree to put down long roots, and it will do so if it can't get all the nourishment it needs from the immediate vicinity. Feed your newly planted tree, and you are actually making it weaker (in the long run). I value this sort of information because I can then figure out when to follow the advice, and when not to. For example, if I am going to be re-planting the tree in the near future, I might be better off with a smaller root-ball, so I may as well go ahead and improve the "nursery" soil. Similarly, this explains why you improve the soil for short-lived plants like vegetables.
In other respects this is a good gardening book for a general audience. It covers a broad range of topics, including indoor plants and wildlife. The photographs are excellent for sharpness and relevance, with useful captions. There is a guide to garden jobs by season at the back.
Flowerdew is of course opinionated. If his opinions don't suit, then you may still find useful information here, but you may be a bit annoyed about disagreeing. For example, he does explain how to deal with close-cropped lawns of fine grass, but he insists that these should only be for bowling greens and the like, and that the rest of us are wasting our time if we're trying to get a general-purpose lawn to look like this.
The only defect I've noticed is the index. It is much too short. Most major topics are there, of course, but it has been kept brief. For example, he proposes a watering system based on syphoning, discussed over two pages with illustrations. However, you will not find "syphon" in the index. It is referenced only as "watering systems".
I'd recommend this book to anyone looking for new ideas and less work in their garden, provided that they are open-minded about organic approaches to gardening.