ITV3 Britain's Busiest Airport: Heathrow Catch up on the ITV Hub Documentary series going behind the scenes at Britain's busiest and biggest international airport - London Heathrow. 4 episodes available to watch Share this programme: Share on Facebook Share on Twitter Share on Google+ Series 2 Episode 1 Yesterday 9pm Life behind the scenes at the UK's biggest and busiest airport. Series 1 Episode 3 Mon Monday 17 Oct 9pm Documentary series about Heathrow Airport. The final episode focuses on Departures. Episode 2 Mon Monday 10 Oct 9pm A new terminal means a royal guest, and a runway must be resurfaced overnight. Episode 1 Mon Monday 3 Oct 9pm Documentary series about Heathrow Airport. This episode focuses on Arrivals.