Choudary was convicted at the Old Bailey after jurors heard that he had sworn allegiance to the terrorist group, and urged his followers to do the same in a series of videos broadcast via YouTube.

Both Choudary and his co-defendant, Mohammed Rahman, 33, urged their supporters to obey Islamic State’s leader Abu Bakr al-Baghdadi and to travel to Syria to support Islamic State, also referred to as “the caliphate”, the court heard.

The pair were convicted in July but details of the court case, including the verdict, could not be reported until today. They both face up to ten years in jail for inviting support for a proscribed organisation, and will be sentenced in September.

Prosecutor Richard Whittam QC said: “The prosecution case is that whichever name is used, the evidence is quite clear: when these defendants were inviting support for an Islamic state or caliphate they were referring to the one declared in Syria and its environs by Ibrahim [Abu Bakr] al-Baghdadi at the end of June 2014.