A spokesperson for No One Above said: “The government has recognised what survivors and experts said from the start: this was trafficking. NOA campaigned tirelessly for this – because only a trafficking investigation can gather the evidence needed for meaningful accountability.”

The Met Police said it had broadened its Al Fayed abuse investigation to include human trafficking. It is understood to have strengthened its team with officers with a background in modern slavery and will contact victims who it feels could be referred.

In March it announced that three women and a man had been interviewed under caution over offences including human trafficking for sexual exploitation and facilitating rape.

It said that 154 victims had come forward and reported allegations of sexual assault, rape, sexual exploitation and human trafficking.

The Home Office would not confirm details of any NRM referrals or specific cases.

A spokesperson said the home secretary had “committed to ensuring that the Home Office supports agencies to work effectively together, and that any systemic issues raised by survivors are given consideration”.