Following the enforcement teams at Heathrow Terminal 3, Calais, Dover.
The past comes back to haunt immigrants, including a couple from Guyana.
A farmer sows seeds of doubt in Lagos; a pregnant woman causes the delay of a flight to the U.S.
The U.K. Border Force charters a plane to deport multiple offenders.
Cameras gain access to the British Commission in Lagos, Nigeria, a city with a strong reputation for fraud; staff at a West London steakhouse are grilled in the search for illegal immigrants.