Season 3

Mainwaring is under orders to be more co-operative with the ARP wardens; a task that's made very difficult by their newly appointed chief. Walker strikes a deal with Jones to make it easier for him to carry rationed goods without being stopped by the police - he is to let the platoon use his butcher's van as a troop carrier and ambulance by day and let Walker use it by night. He bribes Jones with the promise that Jones will receive petrol coupons for it. Unfortunately things don't go entirely to plan...

The platoon travels to a secret location to be trained at a battle school. After a long train journey and a march in which they get hopelessly lost, they arrive late and end up missing two meals and the third is virtually inedible. Starving and tired the platoon tackles the assault course in which they try their best to get back at Mainwaring for getting them lost. The platoon then has to capture the 'enemy's camp' held by Capt. Rodrigues and his men. This task looks impossible but can Mainwaring save the day and win back the respect of his troops? Meanwhile Walker tries to raid the nearby farm to get food for his starving comrades.

Capt. Mainwaring teaches the platoon the tactical use of the phone system when a German plane crashes into the town's reservoir. Because Mainwaring and Wilson cannot decide what to do it is left to Walker to come up with a plan to make the Germans surrender.

When a low-flying German aircraft attacks Warmington-on-Sea, the platoon, under the command of LCpl. Jones, fires at the aircraft and uses up all its ammunition. Mainwaring is furious and orders an investigation.

The bank takes a direct hit during an air raid, but the bomb fails to explode, leaving Mainwaring and Wilson stuck in the vault with it. When the bomb disposal officer leaves to collect the right tools, the platoon members take matters into their own hands.

Capt. Mainwaring is found not to have held the King's Commission so he is reduced to the ranks and Sgt. Wilson takes over command of the platoon. After a disastrous war game against the Eastgate Platoon, his men ask the Colonel for him to be reinstated.

The platoon is given a heavy naval artillery piece but the town's bandstand, a rare example of Victorian ironwork, stands in its field of fire. The town council insists it must be preserved but Mainwaring reasons that a demonstration of the gun's capabilities will quiet any protests.

The platoon captures a runaway barrage balloon, and while trying to secure it, Capt. Mainwaring is carried aloft.

The platoon holds a dance where Pike is going to announce his engagement to a local girl. Sgt. Wilson tries to get him to change his mind but Pike will not be put off.

The platoon is assigned guard duty on an isolated, disused pier for a week. However, thanks to Pike's poor judgement over how to moor the boat, they end up stranded with no contact with the mainland and no food. Attempts at Morse code only prompt Hodges to pursue the platoon to get them to 'Put that light out!' and he ends up stranded himself. If that wasn't enough, Jones spots a stray mine under the pier, but does Hodges have a solution that'll 'bowl them over'?

Godfrey asks to leave the platoon because he doesn't want to fight. Mainwaring is furious and the rest of the platoon shuns him until they find out that he was a hero from The Great War. So he rejoins the platoon as a medical orderly.

The platoon is told to be on the lookout for any abandoned parachutes so Walker tells Mainwaring that he has found one. They also take on a dog which they use to track an escaped German pilot but accidentally arrest a bird watcher.

The search begins for a butterfly spring for a Lewis gun that Frazer has lost whilst cleaning it. The trail leads them through Frazer's workshop to a Funeral Director, to Mr. Bluett's dining room table, to a graveyard. The platoon stops at nothing, committing various crimes including house breaking and grave robbing to get the spring back. But will they find it in time to save Frazer from a court martial?

Capt. Mainwaring has the idea of small armed patrols to wreak havoc upon the enemy using a small re-processed boat the bank has acquired. After a practice on the river they get lost in the fog, and thinking they have drifted across the channel and are about to be captured by the Germans, they are in for a shock when they find out where they really are.