A Manchester man who claims he was tortured at Guantanamo Bay is expected to give evidence to MEPs in Paris.
Mr al-Harith was held for nearly three years at Camp X-Ray
Jamal al-Harith was held as a terror suspect for nearly three years at Camp X-Ray after being captured by American troops in Afghanistan.
He was released by the US in March without charge.
The 37-year-old, from Moss Side, was due to speak to a committee of the Parliamentary Assembly of the council of Europe on Friday.
It is investigating the legality of detentions at Camp X-Ray.
It follows the House of Lords ruling on Thursday which found that Britain's policy of detaining foreign suspects indefinitely breaks human rights laws.
Mr al-Harith is also suing the US government for $5m (£2.58m) but the US has always denied mistreating any prisoners within its custody.