My estimates suggest, conservatively, that some 4 million hectares of hill and mountain in the United Kingdom are used for sheep farming,163 or 22 per cent of the entire farmed area.164 This is roughly equivalent to all the land used to grow arable crops in this country.165 It is more than twice the size of the whole built environment (all the towns, cities, factories, warehouses, gardens, parks, roads and airports),166 and twenty-three times the area we use for growing fruit and vegetables.167 But, in terms of calories, lamb and mutton, across both the uplands and the lowlands, supply just
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