Nadeem Tarmohamed, 29, from Harrow:
He traveled to America with Barot on both his trips, replacing Shaffi on the second when he fell ill.
His close relationship with Barot was revealed by a dedication in his book which thanked him for being "simply invaluable."
Tarmohamed had apparently bought books for the research of the project in 2002 and 2003 and he had read the plans for the American attack on his computer. When Barot was arrested he had a set of keys to Tarmohamed’s address.
Mohammed Naveed Bhatti, 27, from Harrow:
His father is a mechanic at a Jaguar showroom, and Bhatti, who has a degree in engineering, was studying for a postgraduate qualification at Brunel University. Two members of the fertilizer gang also studied at Brunel and Bhatti had a forged library card for the university with Barot’s photograph on it.
Bhatti allowed Barot the use of his parents’ garage where much of the research material for the plot was recovered as well as an encrypted DVD of the American plans. Barot was also given the use of Bhatti’s computer where a deleted draft of the Gas Limos project was found.
Bhatti acted as a chauffeur for Barot and an advertisement for a job as a petrol tanker driver was found at his house – an essential part of one of the gang’s co-ordinated attacks.
Abdul Aziz Jalil, 34:
He rented a safe-house for Barot in London where false identities, money and material from the American trips were stored. He also helped in the research for the project and read the plans for both the American and British attacks on his laptop.
Jalil drove Barot around and appeared to act as his minder during meetings with others. He is thought to have attended a training camp in Pakistan and had applied for an HGV licence, suggesting he planned to drive a lorry as part of the gang’s plot.
Zia ul-Haq, 28, from Wembley:
He had a degree in architecture, planning, building and environmental studies and worked for a firm of chartered surveyors in London. Ul-Haq acted as a kind of consultant for Barot and helped him gain access to specialist libraries.
Barot visited him on several occasions, on one of those traveling to Brent Reservoir where they talked for two hours in the rain.
Qaisar Shaffi, 28, Harlesden:
He traveled to America with Barot on the second reconnaissance trip but fell ill with tuberculosis and had to be taken to hospital and then flown home.
When he was arrested police found printed pages from the Terrorists Handbook which referred to chemicals, explosives and the production of explosives., which had been downloaded from the internet in September 2000.
At Paddington Green police station he made a tearful phone call to his father in which he told him: "I won’t be out soon, I might not be out in five years, ten years, 15 years, 20 years, ever, I don’t know.
"They know I went to America, they know who I met, they know names and say I know people. I haven’t told them anything though.
"Dad pray for me, I’m sorry for what I’ve done. Look after things. Go and pray for me."
Omar Abdur Rehman, 23, from Watford:
He was studying for a degree in graphic information design and had found work at the Ramada Hotel in Watford over the summer – hotels being one of the gang’s targets.
Material on his computer suggested he had been tasked to conduct research into disabling security and fire detection systems.
Junade Feroze, 31, from Lancashire:
His family ran a garage in Blackburn, which could have been used to source cars and gas canisters for the plot.
Feroz sent a number of coded messages from internet cafes, drove frequently to London and acted as a chauffeur and look out for Barot.