The economic geography of the United Kingdom reflects its high position in the current economic league tables, as well as reflecting its long history as a trading nation and as an imperial power. This in turn was built on exploitation of natural resources such as coal and iron ore. Much has changed since Bevan's speech (below) in 1945, with the coalfields largely deserted and the Empire relinquished. With its dominant position gone, the UK economic geography is increasingly shaped by the one constant: it is a trading nation. Agriculture The UK has rarely been self-sufficient in terms of food supply and its modern pattern of agriculture reflects a combination of history, current public policy and comparative advantage. Since the Enclosure Acts of the eighteenth century, the UK's uplands (including Wales and the Scottish Highlands) have largely been associated with animal husbandry and forestry. However, by the time of the Enclosure Acts, most of lowland Britain was already enclosed by processes such as assarting or illegal, but tolerated, piecemeal enclosure. However, evidence of the former open field system of agriculture can still be seen in some parts of the landscape, such as in the indentations remaining from boundary ditches of the former farming strips. Enclosure, in turn, led to intensification. Most UK agriculture is intensive and highly mechanised, with the use of chemical fertilisers and insecticides routine. By European standards it is very efficient, although that does not necessarily make it profitable. This intense nature was compounded in the post-War years, with fields being expanded at the expense of hedgerows. This process has been heavily criticised for damaging biodiversity. East Anglia and South East England have been centres for grain production, with some areas of South East England also specialising in market gardening. The county of Kent was so well known for this that it is often referred to as the Garden of England and was particularly noted for hop growing. Dairy farming is most prevalent in South West England. The detailed pattern of modern UK agriculture is heavily influenced by the Common Agricultural Policy of the European Union, with a combination of price support and set-aside policy. Around the edges of south eastern towns, perfectly good agricultural land often remains uncultivated as a result of price distortions created by the Metropolitan Green Belt. Indeed, since around 2001 speculators have been buying Green Belt agricultural land, generally adjacent to built up