Britain's five former Guantanamo Bay detainees were enjoying their freedom amid mounting calls for them to sue those responsible for their incarceration.

The four remaining former detainees being questioned by anti-terrorist police have been released, bringing an end to their ordeal.

They were taken to locations of their choice after being questioned at the high-security Paddington Green Police station in central London.

The men released were: Tarek Dergoul, a former care worker from Bethnal Green, east London, Ruhal Ahmed, 22, a student, Asif Iqbal, 22, a former parcel depot worker and 26-year-old Shafiq Rasul, all from Tipton in the West Midlands. Jamal al Harith, 37, from Manchester, was released on Tuesday.

Speculation is mounting that some of the men will sell their stories about their stay at the base which lasted for more than two years.

Steven Watt, a British lawyer with the US based Centre for Constitutional Rights, had represented Mr Rasul and Mr Iqbal in their fight for freedom. He said: "It is what we expected to happen. I think what happened in terms of them arriving at a military base in the UK and taken into custody was just window dressing for the benefit of the US government.

"It makes a complete nonsense of Guantanamo and confirms what we have been saying for the very start. They have spent two-and-a-half years languishing in that prison - it is a complete travesty of justice. I think they are owed something by the US government, but whether they will ever be able to get it is another thing.

"George Bush called them 'bad guys' but clearly by what's happened here they are not bad guys, they are entirely innocent. They were in the wrong place at the wrong time."

Nine Britons were originally held at Camp Delta by the US.

Four Britons remain in the custody of the US military at Guantanamo Bay despite calls by their families and human rights lawyers for their release.