As a novice allotment holder, I went searching for books on vegetable growing to complement the RHS Encyclopedia of Gardening that I already had. This book turned up, and has a lot to recommend it if you want good solid information on what to grow where, and how to grow it. It also tells you when to sow or plant, and problems you may encounter, with extra information over and above what is in the previous more general book.
Another good point is that there are sections with up to date recommended varieties in, and the problem solving section is more geared to giving both organic solutions and our more and more restricted choices of pesticides and herbicides, which is where the older RHS books now show their age.
It's only drawback could possibly be that it's more text-oriented than a lot of modern books, having relatively few photographs in it. I found this useful, as you are buying information rather than glossy pictures. If it's pics you are after, then there are other books around which would probably suit better, and this stops me giving it a 5.