A suspected al-Qaeda fundraiser has been extradited to Spain from the UK.
Mr Boudhiba is accused of having links to the 9/11 plot
Hedi Ben Youssef Boudhiba, alleged to have links to the planning of the 11 September attacks, was held in August 2004 at Liverpool John Lennon Airport.
Scotland Yard's Extradition Unit handed the Tunisian citizen over to the Spanish authorities at RAF Northolt.
The High Court rejected lawyers' attempts to block the extradition on the grounds that it would be unjust or oppressive if he was sent back.
A European arrest warrant was issued after Mr Boudhiba was indicted by Spanish anti-terror judge Balthazar Garzon as a member of a Spanish cell which allegedly supplied false documents to 9/11 plotters in Germany.
The extradition was ordered in June 2005 by Bow Street Magistrates' Court.
Mr Boudhiba's lawyers appealed against the decision claiming that Spain had no jurisdiction over acts said to have taken place outside its borders.
They also said medical reports suggested he had a mental age of eight.
However, the judge, Lady Justice Smith, rejected the assertions the request was "legally flawed".
She ruled there was a "connection" between Mr Boudhiba's alleged conduct and Spain, and said it was a "civilised country" and the appropriate place to decide if he was fit for trial.