BBC Red Button (in-universe)

UNIT's Sgt Catherine Petts, not exactly taking the alien contact that had been reached seriously following the disappearance of Guinevere One, she mentioned that they had a "TV channel", and that it was on "terrestrial, digital, cable, satellite, swanky mobile phones, and even behind the bloody red button." (PROSE: Guinevere One)

Behind the scenes
While the name of BBC Red Button isn't exactly given in PROSE: Guinevere One, the description of "the bloody red button" seems to match that of BBC Red Button.