It is an assembly hall of the sort found in any ordinary school. Boys aged 11 and upwards sit cross-legged on the floor in straight rows. They face the front of the room and listen carefully. But this is no ordinary assembly. Holding the children's attention is a man in Islamic dress wearing a skullcap and stroking his long dark beard as he talks.
'You're not like the non-Muslims out there,' the teacher says, gesturing towards the window. 'All that evil you see in the streets, people not wearing the hijab properly, people smoking . . . you should hate it, you should hate walking down that street.'
He refers to the 'non-Muslims' as the 'Kuffar', an often derogatory term that means disbeliever or infidel.
Welcome to one of Britain's most influential Islamic faith schools, one of at least 2,000 such schools in Britain, some full-time, others part-time. They represent a growing, parallel education system.