<p>How one of the first Tesco Clubcards was used to pay off a blackmailer threatening to poison frozen food. And how that Clubcard was used to catch him.</p><p>Presented by journalist and true crime documentary maker Amber Haque and criminal psychologist Dr Julia Shaw.</p><p>Producer: Ciaran Tracey with help from James Shield
Executive Producer: Innes Bowen
Production Coordinator: Juliette Harvey
Mix Engineer: John Scott
Commissioning Editor: Dylan Haskins
Assistant Commissioner: Izzy Lee-Poulton</p><p>Bad People is a BBC Studios production for BBC Sounds</p>
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