While Anita Newcourt prepares for a visit by China's president, immigration officers Eric Day and Caroline Acheson take an interest in an Algerian marathon runner.

Customer services manager Karen tackles a life-or-death situation; shopping consultant Corinne tries to advise the Chelsea football team; and immigration officers Eric and Caroline challenge a group of tourists who are unsure of where they are in the world.

Heathrow's fire service tends to a plane in trouble; immigration officers Eric and Caroline find some Colombian asylum seekers during a surveillance sweep; animal health officer Stuart intercepts a pungent reptile shipment; and El Al's Peter and Sara come to the aid of some pensioners stranded without their wheelchairs.