Britain's Busiest Airport - Heathrow - Season 3

In this episode, a passenger arrives from Doha on the way to Dublin, but his final flight of the journey has been booked from Gatwick, almost 40 miles away. Can passenger experience manager Sue battle a cultural barrier in order to help him? Meanwhile, engineering apprentice Matt heads out onto the runway to calibrate the arrival lights and gets closer to a 747 than he ever thought possible. There is a massive new arrival in the shape of a brand new 787 Dreamliner plane, with senior first officer Dave flying to Seattle to collect the new aircraft. Finally, the airport's dedicated fire brigade extinguishes a fire on a 747, but fortunately it is just a drill.

Passenger Experience Manager Jawad battles a language barrier to get 72 Chinese tourists to their connecting flights to Lisbon, but a problem arises when the group gets split in two and there's only one translator.

Elsewhere, two of the Metropolitan Police's dedicated sniffer dog unit, Buster and Paddy, who look for explosives in the airport, are put to the test on a training exercise.

Also in tonight's episode, Water Services Engineers Jon, Vic and Scott pull the short straw and have to clean a sewage tank - at midnight. But hunting for a sewage leak in the 500-mile labyrinth of pipes under Heathrow is no easy task.

This final episode follows Heathrow's challenge in departing 100,000 passengers a day.

Passenger Experience Manager Numan has a challenge on his hands in Terminal 4 - a flight to New York has been cancelled and 40 angry passengers are demanding to be rebooked immediately.

Also, as snow and ice threaten to close the runways, Airside Operations driver Hugh swings into action to drive a special runway de-icer with a span of 45 meters in Heathrow's first snow maneuver in four years.