The check-in staff struggle with some disgruntled passengers and the airport cops rush to the rescue of a sick baby.

Cops find a gun in a suitcase, while a computer meltdown leaves passengers in the cold. Stansted's cleaners lift the lid on the airport's grimier side.

Stansted's security staff reveal all about their tough jobs. An intruder is spotted by the perimeter fence, a trainee sniffer dog gets lucky and an unattended bag causes chaos in the terminal.

Airside operations manager Dave Cran steels himself for a busy night that will see a team of workers attempt to shorten the runway by a third at the same time as 25 planes are due to land and take off. Meanwhile, the rangers go on the offensive against bird strikes, and dispatcher Julie does battle with the fog.

Groundskeeper Mark wheels out his monster mowing machine. We meet the ecologist making the airport as environmentally friendly as possible - but is there more that could be done to make the airport greener? We also pay a visit to Stansted's queen of clean, who is keeping everything spick and span at the grand old age of 78.

Engineers are busy with critical lights on the airfield, airport cops arrest a man as he gets off a plane and workers battle against freezing fog to get a plane out on time.