UK Border Agency (UKBA) staff arrested 20 foreign students for alleged breaches of working visa conditions following a major raid at their Tesco.com facility in Croydon, South London which organizes home deliveries.
Officers found that the students, Bangladeshis and Indians, had been working far in excess of the permitted working hours allowed by their visa conditions.
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After looking at other Testco staff member's records of employment, a further 3 were found to be in breach of the visa conditions, and action was taken in those cases as well.
The raid took place 3 months ago on 21 July at 3 in the morning.
UKBA fined Tesco £115,000, equalling £5,000 per worker. The maximum fine is £10,000.
The illegal students were found to have been working between 50 and 70 hours a week during the school term, when their visas only permitted 20 hours paid work.
Tesco is a major employer in the UK as well as its largest retailer.