Mohammed Naveed Bhatti, 27, from Harrow, north London, let al Qaida activist Dhiren Barot - jailed last year for plotting atrocities on both sides of the Atlantic - store crucial material needed to plan the terrorist attacks in the garage of his family home.
A draft of the UK "dirty" bomb plot was found in the deleted section of his computer hard drive and an advert for a job as a tanker driver was also recovered.
In addition to the principal attack of detonating limousines packed with gas cylinders in underground car parks, Barot's plans included setting off a radiation dispersal device and using a petrol tanker to cause an explosion.
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Caged ... Junade Feroze, Mohammed Naveed Bhatti, Zia Ul Haq, Nadeem Tarmohamed
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During the time the terror cell was under surveillance in 2004, Bhatti acted as a chauffeur for Barot, whom he met at Friday prayers at Brunel University.
The so-called "computer geek", who had a Masters degree in engineering and was studying for a doctorate, had a false university ID with Barot's photograph on it and a bank card bearing the name of one of Barot's many aliases.
After his arrest, Bhatti tried to commit suicide, and at one point it was thought he might have to be sent to Broadmoor secure hospital, Woolwich Crown Court was told.
The man, described as "peace-loving, shy and withdrawn", was "socially inadequate" and fell "deeply under Barot's influence", said his counsel, Patrick O'Connor QC.
Junade Feroze, 31, who was brought up in Blackburn, Lancashire, by Indian Kashmiri immigrant parents, attended a talk by radical Islamic cleric Abu Hamza and possessed extremist material.
He did not do very well at school and left soon after his GCSEs. He has an intellect below that of an average 12-year-old, the court was told.
At the age of 20 he wed a cousin in Pakistan by arrangement. The couple had a happy marriage and had three children, now aged nine, eight and four.
At 24, Feroze became the English Welterweight Thai Boxing Champion but when his father - an active member of the local Labour Party - died of cancer around the same time he took on a central role in the family garage business.
"This gave him the means to dispose of cars and to obtain both tyres and gas canisters which figure in the plans for attacks both in this country and America," said Johnathan Laidlaw, prosecuting.
Feroze first met Barot at a meeting about Kashmir and the terrorist mastermind was welcomed into the family, the court heard.
During the summer of 2004, Feroze made frequent trips to London and to Luton to visit Barot. He, too, acted as the ringleader's chauffeur and "kept watch" when he was in meetings.
In addition, an application for a Pakistani visa was found at his home with details of a false passport used by Barot.
Feroze's counsel, James Wood QC, told the court that he was a "moderate" Muslim who was used by Barot.
Zia Ul Haq, 28, from Paddington, west London, was an old associate of Barot.
Working for a firm of chartered surveyors in London and with a degree in construction management, his professional expertise made him the obvious choice as Barot's "consultant" - most of the plans involved attacks upon buildings designed to bring about their collapse.
Barot was seen visiting Ul Haq and the men had a two-hour meeting at Brent reservoir.
His fingerprints were found all over bags, documents and disks found in the garage of Bhatti's home.
Ul Haq is also thought to have helped Barot create false identities.
Peter Carter QC said his client was not in Barot's "inner circle" and had, in fact, "turned his back" on him some time before his arrest.
Abdul Aziz Jalil, 34, from Luton, Bedfordshire, rented Barot a "safe house" in London.
False identities, money and material linked to the reconnaissance trips to America were stored there.
Jalil was regularly spotted in Barot's company, driving him around and acting as his "minder" when the ringleader met others.
He used coded messages in internet cafes and his laptop was used to open files discussing the attacks on the US and the UK.
After his arrest in August 2004, his house was searched and a significant amount of material was found showing that he had carried out research into the attacks. It included information on radioactivity, fire and security systems.
His fingerprints were found on a handwritten piece of paper discussing hazardous chemicals.
Copies of Barot's book, The Army Of Madinah In Kashmir, were also found at his homes and he is thought to have considered attending, if not attended, terrorist training camps in Pakistan.
Married Jalil denied going to terror camps. The court was told he had a "meandering lifestyle" and was "nothing like" a second-in-command.
Omar Abdur Rehman, 23, from Bushey, Hertfordshire, took a job at the Ramada Hotel in Watford in the summer of 2004.
Evidence suggested he had been asked by Barot or Jalil to "conduct research into defeating or disabling security and fire detection systems".
He wrote a proposal for the attacks based on his experience of work at the hotel.
When Rehman's home was searched, officers found plans of a security system and the position of security guards. He also had a copy of Barot's book and other extremist Islamic material.
The court heard that on arrest, Rehman was found with two email addresses from which coded emails in the terror cell had been sent.
The youngest defendant, he had a good education attending Christian schools and was studying for a degree in graphic design at the time of his arrest.
His family was "culturally rather than religiously" Muslim and he led a secular existence, the court was told.
But in his late teens he became more interested in his religion and in June 2004 met Barot.
George Carter-Stephenson QC said Rehman wanted to draw attention to the "plight of Muslims" but got "carried away".
Qaisar Shaffi, 28, from Willesden, north west London, was the only member of the terror cell to stand trial.
Several months before 9/11, he accompanied Barot on a reconnaissance trip to the US to view the targets being considered. Among them were the New York Stock Exchange and the IMF building.
Halfway through the trip, in March 2001, Shaffi fell ill and had to return home. But before he left, photographs were taken of likely targets which were used in Barot's US attack plans.
After Shaffi's arrest, police found pages of the Terrorist Handbook at his house which referred to chemicals, explosives and recipes for producing explosions.
He was held at Paddington Green police station and allowed one phone call to his father - which the police overheard - in which he "effectively admitted his part in the terrorist planning".
During a tearful conversation he was heard to say: "Dad, I don't know when I'll be out. I won't be out soon.
"I might not be out for five years, 10 years, 15 years, 20 years, ever, I don't know. Pray for me.
"They know I went to America, they know who I met, they know names and say I know people.
"Dad, pray for me. I'm sorry for what I have done."
Shaffi claimed that he and Barot went sightseeing together on the trip, visiting the World Trade Centre, the Empire State Building and the Chrysler Building.
"I found that a bit boring, I told Dhiren it was a bit boring. I didn't want to see buildings," he told the court.
At college, Shaffi went to jungle raves and smoked weed before starting on crack: "Cocaine, women, hotels, I got a taste for it," he said.
He met Barot though his work at Phone City in Wembley, north London.
Shaffi's counsel, Courtenay Griffiths QC, said he abandoned the conspiracy three and a half years before his arrest and he was 22 and "impressionable" at the time.
Nadeem Tarmohamed, 29, from Willesden, north west London, accompanied Barot on both reconnaissance trips to the US, taking Shaffi's place when he fell ill on the second one.
He was very close to his leader, both men holding credit cards on each other's accounts. Barot also mentioned him in a dedication in his book.
Tarmohamed held a computer account that had been used to access or save the plans for attacks on the International Monetary Fund, New York Stock Exchange and Prudential buildings in the US.
When Barot was arrested, he was found with the keys to Tarmohamed's house.
And at Tarmohamed's parents' address a book on remote control systems was found in the bathroom.
His fingerprints were discovered on carrier bags containing books used to carry out the research which were found among the store of Barot's property in Bhatti's garage.
Tarmohamed married when he was at university but the couple had difficulties and he needed counselling and took medication for depression, the court was told.
Barot came across as an "anti-establishment figure", a "quiet, polite, charming, immensely charismatic" man and Tarmohamed confided in him.
"Their relationship was about intimate matters of the heart," his barrister said.
Tarmohamed found it difficult to say no, but after 9/11 he told Barot he did not want to have anything to do with what was going on, Matthew Ryder added.