Mine is a densely planted, fully landscaped 5 acre garden which I started from scratch, single-handed, 23 years ago. I still manage it single-handed at 78, apart from a little help with the mile of hedge and 6 miles of lawn edge. This garden, and 27 years of previous gardens, are my credentials for reviewing gardening books.
This is a lovely book, written in a light, easy-readable style, with a pleasant wit, and generously and nicely illustrated. A pleasure to own, in fact, and an enjoyable bedtime read. However, despite their vast experience and unquestionable standing in the world of professional horticulture, the authors make blunt generalised statements about individual plants which are patently untrue, for example, recommending plants which in my garden have proved almost ineradicable pests on a par with Aegopodium (so much for "Dream Plants"), condemning as ungrowable others which flourish here without any help from me whatsoever, and making unwarranted declarations about soil requirements in individual cases. But many other gardening writers fall into the same trap. Buy the book by all means, but find out for yourself what does and does not grow for you. (Although do find out your soil's pH for the really obvious cases)
The authors condemn the use of weedkillers. The only problem with weedkillers is improper use, and without such aids, I would have no garden to comfort my old age.