UK Border Force

Immigration officer Lisa Lea checks the passport of a man from Pakistan who says he's doing marketing for his fruit and vegetable business; Lisa is suspicious about his passport stamps and finds out he's running illegal businesses.

At Heathrow's Terminal Three, officers stop a student from entering the UK after a trip home to his native India, while the team in Calais search lorries they suspect are being used to smuggle illegal immigrants.

Police question a suspicious passenger from Johannesburg and officer Dan Brown confronts a man holding false documentation.

A suspected illegal immigrant tries to escape, while another man is suspected of being a drugs mule.

Police crack down on illegal immigrants during rush hour in Calais, France.

A man from Pakistan claiming to be a student is refused entry into Britain after two days of questioning.

A woman arrives at Heathrow from Cape Town claiming she's there for a training course; in reality, she's come to earn money to send back home; officer Kay Lomas is handed the case of a "student" who is trying to re-enter the country from India.

At a reporting center, asylum seekers, foreign criminals and those caught working illegally come to make weekly reports and show they are following instructions while their paperwork and legal status is processed.