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.
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