Drawn to the prospect of a job abroad, people such as Banyu signed up to a language course. From there, their debts to brokers grew

Sitting in a caravan in the hot Kent countryside, Banyu’s face is etched with worry. It is July and he is less than a month into a job picking fruit at Clock House farm near Maidstone, which supplies strawberries, raspberries and other soft fruit to leading supermarket chains.

He says he arrived from Indonesia this summer £5,000 in debt to an unlicensed broker in Bali, handing over the deeds to his family home as surety. He only has a six-month visa for the picking season and is scared that the work is not as lucrative as he hoped.