On a sweltering September afternoon in a packed auditorium at Kingston College in south-west London, Humza Arshad is holding a crowd of more than 100 teenagers spellbound. Wearing a padded jacket and a woolly hat despite the heat, he tells the students that he has come to talk about radicalisation and extremism, "a light topic for a Thursday afternoon", he jokes. About a quarter of the audience raise their hands when asked if they are Muslim; all seem transfixed by the speaker, best known for playing a hapless south London Asian immigrant on his YouTube series Diary of a Badman. Arshad, 31, starts with a bit of dark humour, pointing to a photo of gun-toting terrorists and then reeling off the names of his cousins. Next, the face of a 15-year-old Bangladeshi girl in a hijab fills the screen and a murmur ripples across the room. Some recognise her as Shamima Begum, the straight-A student from east London who left her home in February 2015 bound for Syria. Shamima and her two friends, ...

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