The Observer has more details from the Britons released from Guantanamo about their treatment. In interviews, the men discussed:

• How early in their ordeal they survived a massacre perpetrated by Afghanistan's Northern Alliance troops who herded hundreds of prisoners into lorry containers and locked them in, so that people started to suffocate. Iqbal described how only 20 of 300 prisoners in each container lived, and then only because someone made holes in its side with a machine gun - an action which killed yet more prisoners;

• The existence of a secret super-maximum security facility outside the main part of Guantanamo's Camp Delta known as Camp Echo, where prisoners are held in tiny cells in solitary confinement 24-hours a day, with a military police officer permanently stationed outside each cell door. The handful of inmates of Camp Echo include two of the four remaining British detainees, Moazzem Begg and Feroz Abbasi, and the Australian, David Hicks;

• That they endured three months of solitary confinement in Camp Delta's isolation block last summer after they were wrongly identified by the Americans as having been pictured in a video tape of a meeting in Afghanistan between Osama bin Laden and the leader of the 11 September hijackers Mohamed Atta. Ignoring their protests that they were in Britain at the time, the Americans interrogated them so relentlessly that eventually all three falsely confessed. They were finally saved - at least on this occasion - by MI5, which came up with documentary evidence to show they had not left the UK;

• That their first interrogations by British investigators - from both MI5 and the SAS - took place in December 2001 and January 2002 when they were still being held at a detention camp in Afghanistan. Guns were held to their heads during their questioning in Afghanistan by American soldiers, and physical abuse and beatings were rife. At this point, after weeks of near starvation as prisoners of the Northern Alliance, all three men were close to death.