I used this book throughout my final year of university, and I still do as a design aid. It provides the perfect introduction to building with bales pointed really well towards self-builders. Crucially, it differs from other guides as being specific to the UK and Ireland and the authors expertise in building here means this is covered very well.
If you are looking for a book detailing the history and growth of SB building then this isn't it; check out the Steens excelent books perhaps. There are also books on the subject that go into more detail (Lacinski and Bergerons "Serious Straw Bale" for instance), however this book is concise and holds just the right amount of detail to get you started, especially if you are in the UK or Ireland.
Highly recomended!
Go and build it with bales!