UK's Scariest Debt Collector documentary tells a stroy of Shaun Smith. Ten years ago, he was an enforcer for one of the biggest crime families in Liverpool and embroiled in a war against a rival drug gang. Shaun introduced urban terrorism to the British underworld. He sprayed up houses with machine guns, tortured people and used homemade napalm to firebomb his enemies. Today, after a spell of five years in prison for firearms offences, he is trying to transfer those skills to the legal economy by working as a debt collector in the northern English satellite town of Warrington.