Citing the "Prevention of Terrorism" act, British Police have arrested and interrogated three of the stars of the award-winning film "The Road to Guantanamo", together with the three ex-Guantanomo detainees on whose story the film is based.

...Extensive interrogation established that they had no connection with al-Qaida, and despite their plight being ignored by British authorities, eventually they were returned home. The UK media covered live the return of these "Suspected terrorists" and the massive police convoy that brought them in to Central London for questioning.

BBC online here