The Government has today released files from 1971 under the 30 year rule. The Cabinet decision on Concorde is at:
<a href="http://www.pro.gov.uk/releases/nyo2002/concorde.htm" target="_blank">http://www.pro.gov.uk/releases/nyo2002/concorde.htm</a>
By 1971 HMG was well aware that the project would never make any money, but with critical negotiations on joining the EEC under way, it was impossible to kill it. It's a fascinating insight into the political decision making process.