I have just entered the world of gardening and have decided that growing vegetables is the way forward. I have found this book invaluable in that it gives basic information on every aspect (planning, preparing soil, sowing seeds, compost etc) of growing your own vegetables without being patronising. Maybe all you pro gardeners out there already know all this, but I would think that with so much information in this book, it would be useful even for experienced gardeners.
If you are going to buy one book for your vegetable patch or allotment, make it this one.