Most enjoyable book. I particularly enjoyed the chapter about re-wiggling Swindale Beck and how immediate the results were in terms of salmon redds and other features. Furthermore, in that chapter, the author quotes from the book How to Read Water by Tristan Gooley – which I decided to read next as it sounds both interesting and relaxing...
(To paraphrase the idea: if one notices a river is straight for a length ten or more times its width, one can infer that the river has been artificially straightened.)