The bizarre thing about this book is that it is completely useless.
Lewis-Stempel is clearly an expert in the field of foraging, filling the book with tonnes of details about all the edible wild plants in Britain. You will find descriptions of the look, smell and taste of the plants, where and when to find them, how to harvest them, what they may be mistaken for (particularly if they could be mistaken for poisonous look-a-likes), how to prepare and eat them, including recipes, what health benefits they contain,and a dose of historical backstory too. But there are no pictures. Not a single line drawing or photo. So despite this deluge of intricate detail, it would be completely impossible to actually use this book to help you forage in real life. It would have to be used as a companion to another guide that contained pictures. Lewis-Stempel even says as much. And... if you had another guide, then why would you use this one? Perhaps the guides with pictures don't contain half the detail this one does, in which case, budding herbalists - there is a gap in the market for you to fill!
Personally I could have done without the historical interludes, which might be of anecdotal interest, but have no practical use. I could also have done without the author's 'sense of humour' which is decidedly bawdy, like a lewd old man. One joke that springs to mind is when he says something is a 'wetland dream'. Added to this slightly gross sense of humour, is a disturbing bloodlust. Despite claiming that he believes living creatures are sentient and should therefore be treated humanely, he sure goes into some gory detail on how to go about killing them and also makes more jokes about this subject, which hardly suggests a humane temperament.
For my use as a research tool for a story, it definitely had its uses, but I wouldn't dare put any of this knowledge into practise without a better (pictorial) guide.