I agree entirely with the two reviews here. I won't bother repeating the same things they have said but just add one new point:
The thing I particularly like about this book is the section that is split into months - a 'chapter' for each month. This tells you all the things you should be doing that month including the preparations you should be making for planting, sewing, etc., in the following months. The information is clear, well put, and to the point.
It really is a great book. In my house there are several gardening books, but this is the one that I look to first - and it is usually the only one I need to look at too.