Tonight, Heathrow entertains drones, drugs and drunks. The airport runs at 98 per cent capacity so how will the King and Queen of Terminal 2's customer service, Demi and Sue, cope with the extra load from a closed Gatwick? Meanwhile Border Force Bob is back, doing what he does best - protecting Britain's biggest border.

This time, staff at the airport deal with the aftermath of a polar vortex. Meanwhile, officers Dave and Terry are on the hunt for a wanted man who has gone missing on a plane, and Ian and Steve battle in a snow blizzard as they attempt to keep the runways open.