Guantanamo was set up by the US to hold terror suspects. The US has faced criticism that the Cuban camp breaks international law, because detainees have no right to contest imprisonment.
Many fear torture takes place behind the camp's closed doors.
In an unprecedented move, the government asks the police to investigate their brother officers at MI5 in the case of a former Guantanamo Bay detainee. Andy Davies reports.
Former Guantanamo prisoner Binyam Mohamed has claimed Britain not only knew about his interrogations under torture, but also contributed to the questioning. Simon Israel reports.