The headquarters of Britain's Secret Intelligence Service (MI6) at Vauxhall Cross on the River Thames in central London in this May 14, 1999 file picture.


The referral of the latest case follows a letter written by William Hague, the opposition Conservative spokesman on foreign affairs, asking Miliband whether any British agents were complicit in torture abroad.
He wrote to Miliband following July's report by parliament's human rights committee, which documented a range of allegations of British complicity in torture, particularly in Pakistan.
(Reporting by Luke Baker; Editing by Angus MacSwan)