PH Clockwise from bottom left: Zakir Naik, Omar Bakri, Muhammad Al Arifi and Shady Al Suleiman

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Among their number are: Shady Al-Sulieman An Australian cleric, he is not banned from the UK despite his extreme views. In 2013 British thinktank The Henry Jackson Society warned that there was a case for excluding him from the UK for his support of jihad and Islamist insurgents around the world, including those fighting against British soldiers in Afghanistan.

PH Shady Al Suleiman is not banned from the UK despite his support of Islamist insurgents

Muhammad Al-Arifi A Saudi Arabian cleric finally banned from entering the UK in June 2014 over his calls for jihad in Syria. He had entered the UK on a number of previous occasions, and is believed to have preached at a mosque in Cardiff attended by several young men who later travelled to join Islamic State.

PH Muhammad Al Arifi called for jihad in Syria

Zakir Naik An Indian cleric, Naik was banned from entering the UK in 2010. This was due to his suggestion that “all Muslims should be terrorists” and a speech in which he appeared to support Osama Bin Laden. He has addressed the Oxford Union via video-link.

PH Zakir Naik suggested 'all muslims should be terrorists'

Omar Bakri Muhammad Now banned from the UK, was known as the "Tottenham Ayatollah" during his 20 years in London and called on young Muslims to join Al Qaeda. His preaching is thought to have radicalised Muslims including the killers of Lee Rigby. He fled Britain after the 7/7 bombings in fear he could be arrested for his teachings.

PH 'Tottenham Ayatollah' Omar Bakri Muhammad called for young Muslims to join Al Qaeda