Written by Johnny Speight, it was a two-hander starring Michael Caine and Frank Finlay.
The two characters are confined to a train compartment together on a half-hour journey and Caine's musician begins to resent the older man.
[1] The play was crucial to Michael Caine's career because it was highly acclaimed and increased his visibility.
It also led to him being signed by a new agent, Denis Selinger, and to being offered a number of other TV jobs.
The BBC told him that the tape used for the broadcast was re-used, a common practice on some networks in the early days of television.