Only episode 4 of this story is currently in the BBC Archive.
Peter Stephens was originally going to play one of the characters from Gerald Savory's stage play "George and Margaret," but Savory withdrew permission for his characters to be used at the last moment, and Gerry Davis had to rewrite the script; in fact, it was Gerry who came up with the final edit, but BBC policy at the time forbade him to claim a co-writer's credit for the script.
At the end of Episode Four, there was an apology in the form of an oral announcement after the credits to the estate of Frank Richards, the creator of the schoolboy hero Billy Bunter, because the character Cyril - depicted in the episode as an overage schoolboy - resembles Billy Bunter.