Mohammed Hamid, 50, was found guilty at Woolwich Crown Court of organizing secret terrorist training camps in the New Forest and the Lake District.
He was also found guilty of encouraging Muslims to murder non-believers.
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Three of his followers, Kibley da Costa, 25, Mohammed Al-Figari, 45, and Kader Ahmed, 20, were convicted of attending terror camps in the New Forest and at a Berkshire paintballing centre.
It can also now be revealed that two other members of the gang, Mohammed Kyriacou, 19, and Yassin Mutegombwa, 23, admitted to attending these terrorist camps.
The court heard Hamid led an AL Qaeda-style terrorist cell and aspired to send his recruits to join camps in Afghanistan and East Africa.
Among his pupils were five of the July 21 failed bombers, including ringleader Muktar Said Ibrahim, who attended Lake District camps in 2004.
Detectives said although there is no evidence Hamid organised the attacks, he was partly responsible for the state of mind of those that did.
Hamid, a former drug addict, boasted that the July 7 attacks were “not even breakfast for me” and hours afterwards sent a text message to his friend, July 21 conspirator Hussain Osman.
It read: “We fear no-one except Allah. We will not change our ways, we are proud to be Muslim and we will not hide.”
After asking how many people died in London on July 7, Hamid said: “52. That’s not even breakfast for me.
“That’s not even breakfast for me in this country, do you understand me?
“Now, at the same time, how I look at it, I would take my breakfast and still be with my children and my wife and I’ll be looking after them. Remember Jack the Ripper.”
Hamid organised outdoor activities including camping and paintballing at sites in the Lake District, New Forest, Berkshire, Kent and East Sussex.
The jury found three of these trips were terrorist training designed to recruit, groom and corrupt impressionable young Muslims.
Hamid combined these trips with weekly talks at his east London council home where he sowed the seeds of hate among his followers.
It was during this camp that Ahmet was caught on tape singing a song to the tune of the calypso-style Banana Boat.
The lyrics included: “Come mister Taliban, come implement Sharia … Come bomb England, before the daylight come.”
He was joined in his teachings by Atilla Ahmet, 43, the self-styled emir of the gang, who admitted three charges of soliciting murder at the start of the trial.
Ahmet was Abu Hamza’s right-hand man at Finsbury Park Mosque and took control of his notorious Supporters of Shariah group after his arrest in 2004.
One senior police source said officers will never know whether Hamid and Ahmet intended their followers to attack targets in the UK or overseas.
He said: “They were certainly doing paramilitary training for terrorism. Whether that was to be terrorism overseas or at home, I do not know.
“But five of the people convicted of the July 21 attacks attended these camps. We could not rule out the possibility that these people would go on to commit terrorism here.”
During the four-month trial, the court heard how Hamid boasted to police that his name was Osama bin London after he was arrested with Ibrahim in Oxford Street in 2004.
On another occasion, while driving past Paddington Green police station, he screamed out: “Here is your terrorist, I’m here, come and get me.”