Dark heart of Scotland's most elite schools exposed: Hotbeds of violence, racism and paedophilia. Mind-blowing pupil-on-pupil savagery. Slave auctions. As former pupils speak out on 'cesspits of sadism', GRAHAM GRANT'S shocking investigation

Nightmarish scenes echo William Golding's Lord Of The Flies, the dystopian novel about British schoolboys stranded on a deserted island who descend into savagery without adult supervision.