Changing of the Guard was the first story in the third series of Counter-Measures, produced by Big Finish Productions. It was written by Matt Fitton and featured Simon Williams as Ian Gilmore, Pamela Salem as Rachel Jensen, Karen Gledhill as Allison Williams, Hugh Ross as Toby Kinsella and Philip Pope as Templeton.
to be added
- Group Captain Ian Gilmore - Simon Williams
- Rachel Jensen - Pamela Salem
- Allison Williams - Karen Gledhill
- Sir Toby Kinsella - Hugh Ross
- Templeton - Philip Pope
- Kenny White - Ben Bishop
- William Heaton - Richard Hope
- Kenny White began running the Ruby Club on Old Compton Street in Soho several months earlier after his brother Terry was sent to prison.
- Gilmore describes White as "a dangerous cove" and Allison as "a game girl".
- Allison uses the pseudonym "Rachel West".
- Heaton remarks that Allison was top of her year at Cambridge and noted as "one to watch".
- Templeton refers to The Secret Seven series of books by Enid Blyton and mixes them up with her The Famous Five series.
- Allison refers to the James Bond film series.
- Rachel describes Sir Toby as "pig-headed" and "difficult to get along with".
- This audio drama was recorded on 16 January, 17 January, 21 January and 22 January 2014.
- The theme music has been altered for this boxset.
- William Heaton is a member of the Conservative Party. Sir Toby sneers at his membership of the Sunday Club, "Sunday because it comes before Monday" (meaning the Monday Club), who he says are similar to the US neoconservatives.
- Ronald and Reginald Kray appear at the end. Tim Bentinck says he did the voices in BFX: Counter-Measures: Series 3.
- A Parliamentary Committee is investigating Sir Toby's involvement in the Wilcock Institute Incident earlier in the year. (AUDIO: Sins of the Fathers) Sir Keith Gold is a member of the committee. (TV: Inferno)
- Gilmore refers to the World Cup which is to be held in England in 1966. (PROSE: The Rag & Bone Man's Story, Extra Time; AUDIO: This Sporting Life)
- Heaton refers to Lady Catherine Waverly's apparent suicide in March 1965. (AUDIO: Manhunt)
- Heaton questions Allison about her fiancée Julian St Stephen and his involvement in the Sen-Gen Facility Incident. (AUDIO: Artificial Intelligence) Allison mentions that she was forced to shoot him as he was a traitor. (AUDIO: State of Emergency)
- Heaton refers to General Peters' attempted coup against Prime Minister Harold Wilson's Labour government in October 1964. (AUDIO: State of Emergency)
- Sir Toby and Heaton discuss the Conservative leader Edward Heath. Heaton (wrongly) believes Heath won't win the election. (PROSE: Who Killed Kennedy)
- Rachel refers to Counter-Measures' investigations into Pelage (AUDIO: The Pelage Project), Amsterdam (AUDIO: Peshka) and the Fifth Citadel (AUDIO: The Fifth Citadel).
- Sir Toby refers to the fact that Harold Wilson arranged for Counter-Measures to be fully funded until 1969. Heaton says this will remain in place for the Wilson government but the spending review will be earlier than planned. (AUDIO: State of Emergency)