Blot on the landscape or national heritage? A redundant and vandalised factory in the South Wales valleys is the first post-war building to be officially listed and is now the subject of a public inquiry. Has taste really swung in favour of 1940s concrete? Does this unprecedented case suggest a further move to conserve Britain as a museum in the face of new development?
Jonathan Glancey considers the views of national conservationists, architects, local politicians and local people in weighing national interests against regional needs. Producer JUDITH BUMPUS