In 1982, Roger Cook exposed one head teacher's "reign of terror" at St George's School in Suffolk. So how was Derek Slade able to go on to abuse children in India and Africa?

Roger traces the journey of a paedophile who was convicted of assaulting pupils, stole the identity of a dead boy to disguise his past and conned two UK charities to help fund a school he set up for 'orphans' of the Gujarat earthquake.