When Leah was targeted by an internet predator, her father wanted revenge. So they became...PAEDOPHILE HUNTERS

Leah was approached online in a chat room when she was just 17. Now Leah and her family spend hours online each day trying to stop other young girls falling victim to would-be paedophiles. They have set up fake profiles using old photos of Leah, and they subsribe to Facebook pages popular with teenage girls.