The Times has obtained transcripts of Omar Brooks, now known as Abu Izzadeen, preaching holy war and discussing killing Tony Blair in a recent sermon in London. Abu Izzadeen had previously described the July 7 bombings as “completely praiseworthy” and organised demonstrations in support of the September 11 hijackers.

His organisation, the Saved Sect, was formed from the remnants of the disbanded extremist group al-Muhajiroun, which the Government intended to proscribe. However, it is not on the Home Office’s list of 40 banned terrorist organisations, and a spokeswoman refused to comment on whether it could be outlawed.

The Crown Prosecution Service has not ruled out charges against Abu Izzadeen, which may include solicitation to murder and withholding information about acts of terrorism.

Abu Izzadeen, 31, was born into a Christian family of Jamaican origin, in Hackney, East London, and was known as Trevor to some acquaintances. He converted to Islam at the age of 17 and is believed to have become involved with Bakri at Finsbury Park mosque in the late 1990s.

Before he was fully radicalised, Abu Izzadeen trained and worked as an electrician. He eventually chose a new name, which means “Might of the Faith” in Arabic, and immersed himself in his new religion.

He married and now lives in Leyton, East London, with his wife and three young children.

He is thought to have become the new leader of the Saved Sect. Vitriolic lectures for its website were recorded — until recently — by Bakri, who is in exile in Lebanon. But Abu Izzadeen has started preaching sermons and posting them on the website, suggesting that he has taken over as emir of the Saved Sect.

He is one of a generation of young British-born radical converts to step into the shoes of notorious clerics such as Bakri, Abu Qatada and Abu Hamza al-Masri. Abu Hamza is in jail and Abu Qatada is being held without charge under anti-terrorism laws.

The Saved Sect, also known as the Saviour Sect, rejects democracy and wants Britain to adopt Sharia, or Islamic law. It believes that it is the only group representing the true Islamic path, but has links with another al-Muhajiroun successor, al-Ghurabaa, whose leader was arrested during extremist protests against the publication of cartoons depicting the Prophet Muhammad.

In lectures given last month at an unknown London location, Abu Izzadeen said that a war was being fought to make Islamic law “completely dominant” in Britain, and that “all Jews and Christians are going to hell fire”.

He also praised Mullah Omar, the Taleban leader, saying: “This man is a winner.” His lectures, entitled The Christian Crusades parts 1 and 2, describe conflict in the Middle East and Britain as a present-day crusade.

Abu Izzadeen said: “There is a war here [in Britain]. Maybe you don’t have weapons, but there is [sic] arrests against the Muslim community, there is brutality by the police. It is a form of war against the Muslims here as well.” He elicited laughter when he said: “If I said to you we’re going to conquer Rome, or if I said to you, we’re going to kill George Bush and we’re going to kill Tony Blair, you said to me: ‘Which come first bro?’.

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