The Supreme Court has said that Abdul Hakim Belhaj’s allegations about rendition are so serious they have to be heard before a British court because, if not, they may never be heard anywhere else in the world. See chapters 4 and 6 of Belfast to Benghazi for comment.
http://www.waterstones.com/book/belfast-to-benghazi/rupert-wieloch/9781861515667