A freak snow storm shuts down the British transport system. Just one flight lands at Heathrow, re-directed from Gatwick. A charismatic passenger from Antigua charms the immigration staff. But his complex case creates a division between the immigration officer and her boss. A Welsh immigration team makes a routine arrest at a Chinese takeaway but when they search for a passport they find a complicated family arrangement. Also in this programme, customs officers at Heathrow target travellers who try to smuggle illegal animal products into Britain. They find bags of Ugandan grasshoppers, illegal Turkish cheese and the testicles of a grizzly bear.