Others are transported from Afghanistan to secret prisons under American control - in Eastern Europe countries like Poland, Romania, Hungary and in Asia, the military base at Diego Garcia.
A Member of the European Parliament should ask Jack Straw about this during the debate on Wednesday on Iraq and Iran... The EU Commission is supposed to release a statement about the secret prisons Monday as well... guaranteed to evoke a violent reaction from police is to challenge their right to "define the situation." --- David Graeber citing Marc Cooper
"Treason doth never prosper: what's the reason? For if it prosper, none dare call it treason."
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I would guess that it might well be technically possible to sue the UK government over illegal activities at Diego Garcia under both British and EU law. Obviously, any "prisoners" who died there should be subject to an inquest to determine the circumstances and causes of their deaths - but that would presuppose information regarding who is held there and their fates coming to light. It no doubt will....eventually.
I don't know what kind of agreements exist between the US and UK governments regarding DG - they're no doubt highly classified secrets - but the fact of an official UK presence there suggests that we still assert territorial, and therefore, presumably, legal sovereignty over the island.