Tannoy (The Man from MI.5)
On the Fireflash flight in 1965 which took Lady Penelope Creighton-Ward from England to France so that she could meet with MI5 agent Jimmy Bondson, a tannoy made an announcement to all passengers. Towards the end of the journey, she informed all those aboard they were approaching their destination airport in Nice. As well as ordering them to extinguish their cigarettes and fasten their seatbelts, the tannoy expressed her hope that the experience was a pleasant one and that they would travel together again at some point. (TV: The Man from MI.5)
Other sources dated the activities of International Rescue to the 1990s, (PROSE: The Dying Days) the 2060s, (PROSE: Titan Declares War! et al.) and the 2080s. (PROSE: Captain Scarlet in Death Crash! et al.)
Behind the scenes
The tannoy was the only character in The Man from MI.5 who was not visually depicted. Aside from the regulars of Lady Penelope, Tin-Tin and Grandma, she was also the only female in the story.