Filming the helicopter crash scenes for episode 5 in season one took place on September 11th 2001, the day of the terrorist attack on the Twin Towers in New York. Filming was interrupted when cast & crew heard about the horrific news from New York. The helicopter crash set was located beside the home of the now notorious Jimmy Saville in Glencoe Scotland. Saville even turned up on set on 9/11 to greet the cast and crew. In hindsight a very unusual day.