The trial of seven men accused of planning to build a homemade fertiliser bomb to use against targets in the UK relied partly on hours of surveillance evidence and recordings of bugged conversations.
Omar Khyam, the ringleader, was followed by MI5 and counter-terrorism officers who had been on the trail of al-Qaeda sympathisers in the UK.
In February 2004, counter-terrorism officers began round-the-clock surveillance of the key suspects, including recording bugged conversations.
The complete operation included:
24,000 hours of video
3,000 hours of audio
33,000 man hours of surveillance
80 computers examined after arrest
Two of the accused, Nabeel Hussain and Shujah Mahmood, were found not guilty.
These are excerpts from key bugged conversations heard in court during the trial. Some of the sentences have been edited to assist comprehension.