On 5 November 2018 the British Film Institute announced plans to show Season 3 Episode 6 "The Day Out" as part of their 25th annual "Missing Presumed Wiped" event. A copy was found in a storeroom in Monaco Television from where it has been recently recovered and restored.
Only 11 of the 32 episodes are known to survive as of March 2021, with the rest presumed to be lost: these comprise all of the first season, two from the second and three from the final run.