Successful Smallholding: Planning, Starting and Managing Your Enterprise by J.C.Jeremy Hobson
Downshifting has become synonymous with selling up, starting a smallholding and escaping the rat race. Some people are lucky enough to purchase a property large enough to ensure that the whole family is self-sufficient, but for most only enough land will be available to make smallholding a hobby (ed: that's the point of smallholding, if there's enough land to make a good living it's probably not a smallholding).
Apparently, this book caters for those with a small amount of land and for the lucky minority with a much larger acreage.