On Wednesday, 1 September, a 41-year-old man attended St Aldates Police Station in Oxford where he told officers that he was the victim of modern slavery offences alleged to have been committed in London.
The driver is believed to be a black male with a white Mercedes.
Detective Constable Alex McGregor, who is leading the investigation, said: “The driver of the Mercedes provided much-needed help to the victim in this case and he is extremely grateful that he dropped him off close to a place of safety.
“We need to identify the driver and speak to him about the incident to progress our investigation and would urge him to come forward.
“The victim is white with short/shaven hair, does not speak English and was wearing dark Puma tracksuit bottoms, white trainers, a black jacket with grey sleeves and a white and yellow tie dye hoody.