S7, E4: Spring is about to be sprung and Heathrow is readying itself for a flurry of passengers as it's announced that holiday makers can travel to 12 new countries. To keep Britain safe - and to keep it as simple for passengers as possible - a new traffic light system has come into operation, dividing Heathrow's 206 destinations into colours. Passenger Service Manager Demi is tasked with helping the many confused passengers, including one very agitated Granny-to-be.