Former university lecturer and her husband kept a slave in their $1.5 millon house

Ex-university lecturer Pritpal Binning and her husband Palvinder are suspected of keeping Polish builder a slave in the garden shed of their $1.5 million home.

Pritpal, 56, and Palvinder, 54, are arrested by the Gangmasters and Labour Abuse Authority (GLAA) following a raid at their property in Chilworth, near Southampton, over modern slavery offenses, as reported by Daily Mail.

The frail Polish man, who was kept a builder in the British couple's garden shed for four years, walked into an NHS walk-in health center and told the staff he'd been forced to work in exchange for food.

According to a GLAA spokesman, the man, who is in his 40s, told the GLAA that Pritpal and Palvinder had given him just a plastic sun lounger to sleep on and out-of-date food to eat.

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He also claimed that he had no flushing toilet and his kitchen was a fridge and a grill.

At one event, while he was working, he stopped to talk with a neighbor. However, Pritpal, a former Southampton University health sciences lecturer, yelled at him.

The spokesman said that the man had been acknowledged into the government's national referral mechanism.

Pritpal and Palvinder have been released under investigation pending further inquiries.

"We are pleased that the man is now receiving the help and support he so desperately needs. In the 21st century, no one should be forced to live in such degrading and disgusting conditions," said Tony Byrne, GLAA senior investigating officer.

Byrne added, "Following the two arrests we made, our investigation is ongoing as we examine and assess the evidence we collected from the property."

According to Australian rights group Walk Free Foundation, Britain is home to an estimated 136,000 slaves, Daily Mail reported.

A 79-year-old British man was also arrested on suspicion of modern slavery after discovering an alleged victim who is believed to have lived in a shed for the past four decades.