Abdul Patel was said by the prosecution to be "ready, willing and able" to help terrorists bombers.

But an Old Bailey jury cleared him of having the manual for an act of terrorism. Instead he was found guilty of having a document likely to be useful for terrorism.

Judge Peter Rook warned Patel, 18, of Clapton, east London, that he was keeping "all options open". He remanded him on conditional bail to October 26 for sentencing.

Abdul Patel was only 17 when police found him with the explosives manual on home-made bombs at his wife's family home in August last year.

Peter Wright, QC, prosecuting, said: "Abdul Patel is part of a web of radicalised young Muslim men in which his possession of the explosives manual was not innocent.

"It was entirely deliberate. It was available for use if called upon. It was in the custody of a young man who was ready, willing and able to assist in a cause he believed in."

Patel denied the alternative charges. He told the court it had been left with him in one of two boxes by a man who was known to his father. He had asked the man to take the boxes away after looking at their contents.

Also in one of the boxes, was a CD labelled Love Songs which contained an Islamist address ostensibly aimed at American service personnel.

It said: "We promise we will not let you live safely. Our Mujahadeen are coming to you very soon to let you see what you did not see before."