The last two episodes of the first season were held over from February to June 1966 when U.K. Prime Minster Harold Wilson called a surprise General Election. To avoid accusations of political bias ATV temporarily shelved the remaining editions until after they had a gap in the schedules.
In an "NME" interview published on Friday, March 11, 1966 John Lennon revealed the series was his favorite television show, followed by Secret Agent (1964) and The Rat Catchers (1966).
Wayne Hill's theme tune for the series won an Ivor Novello Award for Instrumental Composition of the Year for himself and publisher De Wolfe Music.
After the series ended, the public demanded its return and a fourth season was planned by ATV. This did not happen due to the unexpected death of Patrick Wymark of a heart attack in 1970, ten months after the third season closed.
Cyril Stapleton was responsible for the trendy 1966 rearrangement of Wayne Hill's theme tune for the second season. His cover would be adopted by Middlesbrough Football Club, and was also a popular Northern Soul track.