For seven years he was held in detention in four countries, claiming that he was tortured brutally in Morocco before being sent to Guantánamo Bay, where his presence as a UK resident caused friction between London and Washington.

Yesterday Binyam Mohamed, 30, arrived back in Britain – where he has no home or family – presenting the Government with a complex security and immigration dilemma.

Mr Mohamed, who was arrested in Pakistan in 2002 on suspicion of plotting to detonate a radioactive “dirty bomb” in the United States, was detained – not arrested – after flying in to RAF Northolt, northwest London, aboard a Gulfstream jet chartered by the Government to fly him back from Cuba.

The Ethiopian-born man who came to Britain in 1994 to claim asylum, was yesterday held under the Terrorism Act 2000 and questioned by the Immigration Service and the Metropolitan Police for five hours.

He was granted temporary admission to Britain for two years. The Home Office must now try to decide how to deal with any application by Mr Mohamed to stay in this country permanently, should he wish to do so.

In a statement issued by his lawyer, Mr Mohamed said: “I have been through an experience that I never thought to encounter in my darkest nightmares. Before this ordeal, ‘torture’ was an abstract word to me, I could never have imagined that I would be its victim.

“My own despair was greatest when I thought that everyone had abandoned me. I have a duty to make sure that nobody else is forgotten . . . I am not asking for vengeance; only that the truth should be made known, so that nobody in the future should have to endure what I endured.”

His first move after more than four years at Guantánamo will be to go “somewhere really quiet and away from everyone”, Clive Stafford Smith, his lawyer, said. His sister Zuhra – an American citizen – has flown to Britain to be with him.

Although MI5 is not expected to interview him, the latest Guantánamo detainee to be flown to Britain will be closely monitored while the authorities decide what to do with him.

His allegations of torture while in US custody are being examined by Baroness Scotland of Asthal, QC, the Attorney-General, following the accusation that MI5 knew that he was a victim of the CIA’s “extraordinary rendition” in which he was flown to Guantánamo via Morocco and Afghanistan after arrest in Pakistan.

An MI5 officer interviewed Mr Mohamed in prison in Pakistan in 2002 and supplied the CIA with further questions to ask him. But according to Whitehall sources, the Security Service was not told where he had been taken. “The CIA refused to tell MI5,” one source said.

In his statementMr Mohamed said: “For myself the very worst moment came when I realised in Morocco that the people who were torturing me were receiving questions and materials from British Intelligence.”

British officials visited Mr Mohamed at Guantánamo on February 14 and decided that there was no medical reason to prevent him from returning to Britain, despite reports that he had been on hunger strike in protest at his detention without charge.

Mr Mohamed has reached a voluntary agreement with the authorities to live at a notified address and report regularly. He will not be placed under an antiterrorism control order and will be allowed access to telephones and the internet.

He said: “It is still difficult for me to believe that I was abducted, hauled from one country to the next and tortured in medieval ways, all orchestrated by the United States Government. While I want to recover and put it all as far in the past as I can, I also know I have an obligation to the people who still remain in those torture chambers.”

David Miliband, the Foreign Secretary, said: “I am pleased that Binyam Mohamed has returned to the UK. This is the direct result of our request for his release and return.” Lord Goldsmith, QC, the former Attorney-General, called for an independent inquiry chaired by a judge or a QC. “Either the stories [of torture] are not true, in which case it is important to have them dismissed, or if they are true, it is a very serious state of affairs,” he said.

Britons who returned from Guantánamo

Omar Deghayes Libyan-born - given refugee status

Abdenour Sameur Algerian from south Harrow, came to Britain aged 16 - given refugee status

Bisher al-Rawi from southwest London - UK resident

Feroz Abbasi Ugandan-born. Came to England with his family aged 8 - UK national

Moazzam Begg from Birmingham - UK national

Richard Belmar from North London - UK national

Martin Mulbanga from North London - dual Zambian and UK citizenship

Shafiq Rasul from Tipton, West Midlands - UK national

Asif Iqbal from Tipton - UK national

Ruhal Ahmed from Tipton - UK national

Tarek Dergoul from East London - UK national

Jamal Udeen from Manchester - UK national

Times Recommends

• UK regional accents thrive against the odds
• ‘Scarecrow’ wind farms put rare birds to flight
• What an anti-climax: G-spot is a myth