The ruling by an 8-1 majority held that the indefinite detention without trial at Belmarsh, and Woodhill high security prisons was unlawful under the European convention on human rights (ECHR).
Constitutional lawyers called it one of the most important decisions from Britain's highest court in 50 years.
Lord Hoffmann, ruled that there is no "state of public emergency threatening the life of the nation"- the only basis on which Britain is entitled to exercise its opt-out from article five of the European convention, the right to liberty. It was the anti-terror laws introduced by Mr Blunkett which posed a threat, he declared. "The real threat to the life of the nation, in the sense of a people living in accordance with its traditional laws and political values, comes not from terrorism but from laws such as these."
Lord Scott described the regime under which suspects can be detained indefinitely on the say-so of the home secretary with no right to know the grounds for detention as "the stuff of nightmares, associated with France before and during the revolution, with Soviet Russia in the Stalinist era, and now associated, as a result of section 23 of the 2001 Act, with the United Kingdom".
The judgment does not oblige the government to release the detainees immediately, but under the Human Rights Act the government must take steps soon to remedy the situation. These could include legislation - for example, making evidence obtained from telephone tapping admissible in a criminal court - which would make it easier to try detainees. Another option would be measures allowing them to be released under constant surveillance and monitoring.
http://www.guardian.co.uk/uk_news/story/0,3604,1375684,00.html