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Walker is called up into the army. The platoon, anxious at how they will obtain off-the-ration supplies without him, fight to keep him.

When Frazer spots what he believes to be a German spy who is in the act of signalling to planes, the platoon arrests a suspect who protests that he is a naturalised Englishman.

Mainwaring has the opportunity to promote someone to corporal. Rather than promote Jones, he tests who has the greatest potential by temporarily promoting Private Frazer to lance corporal. Frazer's increasingly dictatorial manner soon alienates the platoon.

Mainwaring orders the platoon to parade as usual on Christmas Day.

The platoon have joined forces with the ARP warden and the local WRVS to form a choir for an upcoming Christmas concert.