The Metropolitan police investigation, codenamed Operation Lydd, into the rendition of Libyan opposition activists in 2004 is considering the role of British officials in the combined operation by MI6 and the CIA.
Belhaj and another dissident, Sami al-Saadi, spent six years in jail and were, they say, frequently tortured.
In March 2004, Saadi – along with his wife and four young children – was forced onto a flight out of Chek Lap Kok to Tripoli. CIA documents detail the Hong Kong government‘s complicity with British and US spies involved in the rendition.