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.

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.