The right hon. Gentleman makes an important point, which should perhaps be debated more fully in the other place. I absolutely agree that this is a strong point that needs to be considered.
Returning to the low number of prosecutions, in 2011-12 there were 15 prosecutions for slavery offences, but no convictions. Since the introduction of the offence, there has shockingly never been a prosecution where the victim was a child. In 2011, there were 150 prosecutions for trafficking offences, but only eight convictions. To put those figures in context, in 2013 the national referral mechanism received 1,746 separate referrals of cases of human trafficking, 432 of them involving minors. The UK Human Trafficking Centre identified 2,744 victims of human trafficking last year, 600 of whom were deemed to be children.