David, who is the elder brother of current Labour leader Ed Miliband, is also said to have told Aamer’s family he was trying to bring him back to the UK. Aamer’s lawyers claim this was used to “silence” his client.
Aamer has been held in the controversial US prison since 2002, on suspicion of being a terrorist linked to former Al-Qaeda leader Osama Bin Laden.
However, while he has been cleared twice for release by US authorities, his stay was extended as authorities attempted to extradite him to Saudi Arabia, his birthplace, rather than return him to his family in Britain.
Letters dated August 2007 show that talks regarding Aamer’s release between the UK and US had “broken down” and that the UK had instead sought to extradite him to Saudi Arabia.