You will never starve if you are growing Jerusalem Artichokes. These are a root crop, but the tops can be use to feed stock, & the dried stalks make excellent kindling. If you are going bush, take some of the rhizomes with you. They will multiply. These are native to the Great Lakes area in North America, they grow very well here in the temperate climate of New England in Australia. You should have no problem growing these in the UK. Keith.