File on 4 highlights one fraud phone call, in order to shine a light on how scammers work. A man rings a company pretending to be from the bank. How does he persuade a victim he is legitimate? We consider the psychological, financial and emotional impact fraud has on those involved, and we hear from experts hunting the perpetrators.

Producer: Vicky Carter Reporter: Iona Bain Technical Producer: Kelly Young Production Coordinators: Tim Fernley and Jordan King Editor: Clare Fordham