I cannot believe that these National Trail Guides can be beaten. I have seen better ideas in other guides, such as diagrammatic charts of the terrain but all in all the combination of Ordnance survey , contryside commission and experienced walkers make all the National Trail Guides that I've read just about definitive. I tackled Offas Dyke after very little experience of long distance walking. The books description had whetted my appetite and the actual experience more than fulfilled the promise. The book was an essential tool for the walk , even the blank spaces were used for a daily log, and now the battered remains serve as a lasting memento. Having now completed several walks using guides in this series it has become apparent that each chapter fits a days walking, this despite efforts to improve.The additional information regarding facilities and accommodation are very helpful. This praise does not bely the fact that we have experienced frustrations using the books as guides, over and above the normal complications of fatigue ,weather etc. My companion and I often questioned whether the Author had actually walked some of the stretches in person and certainly whether he had actually walked the total length in one go. Also the yellow line which is intended to highlight the path tends to be too broad and on occassion adds to confusion over exact route,e.g. through farmyards etc. A 2.5 inch map is necessary to accompany these guides as the integral route maps are sometimes too narrow to orientate with distant landmarks.Also some of the descriptions of terrain tended to be understated ,short sharp ascents as described in the guide were in reality hellish unending climbs! Or am I just a wimp? Despite these niggly points it cannot be denied that these publications are a mine of useful information presented in a readable and enjoyable format. Offa was obviously a sadistic tyrant,his dyke was intended more as a warning marker than a defence and as this book amply testifies his legacy is breathtaking in its message. No geographical or geological feature was allowed to stand in the way of its construction . The walker can only marvel at the implaccability of its constructors. The guide is as useful and as essential as a good pair of boots!