Catching the Black Cab Rapist

S1 E1: John Worboys preyed on the women of London, drugging, raping and sexually assaulting over 100 victims in his taxi cab between 2000 and 2008. In this chilling true crime documentary on BBC Select, some of his victims and the police team that finally cracked the case discuss flaws in the original investigation. Why did it take so long to bring Britain's most prolific serial rapist to justice?