This episode was first broadcast on December 10, 1970 but power cuts in parts of the UK prevented viewers from watching the final minutes of the play. It was repeated on February 25, 1971, becoming the first episode to have a repeat broadcast.
While this episode was made and broadcast in color, the BBC wiped the master tape in the 1970s. The play survives in the archive as a black-and-white 16mm telerecording.
Later adapted into a stage play, performed at the Yvonne Arnaud Theatre, Guildford, in 1974.
The envelope shows that the Summers' live at 41 Royal Crescent, London SW2.