This episode was wiped by the BBC and no copy of it was known to exist until 2001, when a 16mm telerecording was returned to the BBC by a member of the public. It had been saved purely by chance when it was taken out of a tip at Elstree Studios in the 1970s. Along with the similarly rediscovered Operation Kilt (1969), it was broadcast on BBC Two on December 28, 2001. This was the first time that the episode had been shown on television in 32 years.
Amy Dalby (Dolly Godfrey) died on March 10, 1969, only two days after this episode was originally broadcast, at the age of 81.
Whilst there is no German invasion due to a misunderstanding, this episode is the most serious in terms of plot for the series, given that four of the 7 main cast talk about and are even prepared to lay down their lives to fend off the impending invasion.
This episode was repeated on August 22, 1969.
The recovered 16mm film had a splice with about five seconds of film missing and damaged. Towards the end when Captain and Sergeant are arguing about who surrendered first, all of a sudden Hodges appears talking about seeing a light in the window. The missing part is how Hodges entered the cottage. During transfer, so that the film looked constant, a total of seven seconds of the original edited footage is missing.