Unlike many British series of the era, the vast majority of episodes of this series still survive. Nevertheless, four episodes are missing: "Back Pay", "The Rescue", "Soul Mates" and "I'm in a Dancing Mood".
Although there is doubt as to whether a new episode was ever actually broadcast on the date attributed to "Back Pay".
The second series was severely affected by a five month strike by the actors' union Equity during which no guest actors were permitted. As a result, only the show's four contracted stars Alfie Bass, Bill Fraser, Robert Dorning and Clive Dunn appeared in the episodes broadcast between early November 1961 and April 1962 (except for the pre-recorded "The Second, Second World War").