Look over the fences into the gardens, patios, courtyards and allotments behind, and you'll see a quiet revolution taking place. Amongst the lawns, the roses and the concrete, more and more of us are growing at least some of what we eat. A kitchen garden can be anything from a collection of pots to a small farm - it all depends on where you live and what space you have to create your own edible plot. 'The New Kitchen Garden' doesn't begin with the usual plan of an allotment quartered into beds awaiting their rotation, it starts by asking what you need from your garden. What follows is a series of invitations - fruits, nuts, herbs, spices, flowers and vegetables to grow and eat