Everybody should walk more and this book will encourage you do just that. The 30 walks included are quite varied and they will take you to all parts of London and even further (e.g. Windsor and Eton, Richmond and Hampton Court). Andrew Duncan includes all the practical information you need, i.e. maps, distances and an estimation of the length of time each walk will take, but he also includes lots of interesting details to look out for as you walk, snippets of relevant history and great places to stop for a drink or a sandwich and a cup of tea. The book is illustrated with beautiful photos of places you should definitely look out for on your way - Jacob Epstein's wonderful Madonna and Child which is fixed to an arch just off Cavendish Square and the Triton fountain in Regents Park, for example.
The book is well indexed and the "Historical background" section is informative and will be especially helpful to anyone not entirely sure who the Adam brothers were or whether King William IV came before or after all the Georges.
I think this book is a great guide to our capital. However well you know London, I think you will find many facts and places you didn't know if pick up this book and walk.