Haroon Syed has been jailed for life with a minimum term of 16 years and six months at the Old Bailey.

Syed had mulled targeting an Elton John gig in Hyde Park on the anniversary of 9/11.

Syed was caught after he tried to buy weaponry online from "Abus Yusuf", who he thought was an ISIS sympathiser, but was actually a pseudonym used by British intelligence.

Haroon Syed, of west London, admitted preparing acts of terrorism after trying to source weapons including a suicide bomb and machine gun.

His older brother, Nadir Syed, was jailed in June past year for planning a beheading on Remembrance Sunday in 2014.

The Old Bailey heard his brother's arrest was the trigger for Syed's radicalisation, and he fell under the influence of Al-Muhajiroun, the banned group linked to hate preacher Anjem Choudary.

Home Office approved de-radicalisation expert and Bradford imam Alyas Karmani told the court there should have been earlier intervention in his case.

In May (17) Britain was rocked by a terror attack at a concert which left 22 music fans dead when 22-year-old Salman Abedi detonated an explosive device moments after Ariana Grande finished performing at the Manchester Arena.

Sentencing Syed to life with no chance of parole for 16½ years, the judge said the young man had been "deeply committed to the ideology of a brutal and barbaric organization that sought to hijack and corrupt an ancient and venerable religion for its own purposes" - the Islamic State group.

Syed was captured due to the efforts of undercover MI5 officers. If I go to prison, I go to prison.

When police arrested Syed at his family home in Hounslow, west London, on September 8 past year and demanded his PIN code, he said: "Yeah, ISIS. If I die, I die, you understand", he said, referring to the popular shopping street in central London. When police asked for the password to unlock his phone, he said: "Yeah, I.S.I.S".

The defence, pursuing the usual exculpation, argued that Syed was vulnerable to radicalization because of a turbulent family background, lack of education - though he was an IT college student - ignorance about Islam and addiction to violent online games, his bombing plans a "fantasy" indistinguishable from the games he played on his computer.