As the Government prepares to publish its report on the `Trojan Horse' affair in Birmingham, Dispatches investigates the role of faith communities in schools. The programme hears from those at the heart of the recent controversy and films undercover in a primary school where clapping and whistling are banned as `satanic' practices. It also uncovers a network of illegal institutions where more than 1,000 boys are being taught suspicion of the outside world, and the only subject on the curriculum is religion