Lox, this from The Telegraph.
She says "gangs" plural.

Hilary Willmer, from the Coalition for the Removal of Pimping (Crop), said while she welcomes the new initiative, tackling internal trafficking would be hampered by a law that dictates girls over 13 should give evidence against their handlers in court - something they are rarely willing to do.

"It can happen to any child from any family," she said. "The men, the gangs have all the experience. The children, the families and the parents are bewildered, don't know what's happening.

"In practice, unless the primary victim is prepared to give evidence then it's very difficult to make charges stick. The men know this, so they often wait until the girls are 13 before actually having sex with them."