Black cab rapist John Worboys is a 'significant threat', says Sadiq Khan

Black cab rapist John Worboys is a "significant threat to Londoners' safety", Sadiq Khan has said, as the case challenging his release from prison started in court.Barrister Phillippa Kaufmann QC argued on Tuesday that there is scant evidence to show Worboys is not dangerous, and that the hundreds of assaults he may have committed "completely undermined" the decision to free him.The case against his release, which has been partly crowdfunded, has been taken to the High Court by the London mayor