Immigration officers carried out the raid earlier this week at Panattoni Park, the former home to Honda in Swindon, alongside Wiltshire Police.

Supt Mike Vass, Swindon hub commander, told the BBC: “This was a significant operation with our colleagues in Immigration targeting illegal working and safeguarding vulnerable individuals who may be being exploited.”

He added: “It came about through vital information into our intelligence unit.

“I would encourage those who have concerns about illegal working or the exploitation of vulnerable people to report it to us on 101 or through our website.”

The Home Office told the Swindon Advertiser that those arrested were of Indian and Albanian nationality, with 25 detained pending their removal from the UK while the remaining five were placed on strict immigration bail and required to report regularly to the Home Office.