When the transmission the space station is interrupted, the TV channel shows a western. The clip is from another Gerry Anderson programme, Four Feather Falls (1960), possibly the episode called "Ambush". transmitted on 2nd November 1960.
This episode was the 25th episode produced and the 20th broadcast.
In this episode Steve Zodiac and Venus are floating in the vacuum of space, but they talk to each other without radios which would be impossible as sound does not travel in a vacuum. Also they have no space suits to protect them, this would cause their blood to boil and they would die within seconds.