A reorganization within the store forces the staff of the gentlemen's ready-to-wear department to share their floor space with the Ladies' Department. Mrs. Slocombe, head of the Ladies, and Mr. Grainger, head of the Gents, immediately come to loggerheads over control of the center floor display. Mr. Grainger refuses to take down his trousers and put Mrs. Slocombe's underwear in its place. Undaunted, she goes over his head to Captain Peacock, and then to Mr. Rumbold.

Mr. Lucas attempts to send Miss Brahms a love letter suggesting an after-work "get it together". Confusion on who sent the letter and to whom it was intended sets the stage for a lot of misunderstanding. There's also the customers to contend with and Mr. Lucas has a devil of a time fitting them into clothing.

The Department figures have taken a dive and so Mr. Rumbold decides to convene a sales conference amongst the staff. Since the meeting is taking place after hours and off the clock, no one is very motivated to provide any solutions. If something isn't done, someone might lose their job, and that someone is clearly Mr. Lucas.

A transport strike leaves the staff stranded at the store, so Young Mr. Grace offers to let them spend the night on the floor. Tents are set up, but Mr. Lucas has trouble keeping his up. A "campfire" sing along leads to talk of the last World War and the experiences some of them had.

Mr. Grainger's trousers are missing, along with the central display. The staff learns that the space was freed up for the "His & Hers" fragrance display. Mrs. Slocombe is outraged that they went her to take down her underwear and put perfume there in its place. The glamorous salesgirl causes stirrings in the trouser department. When it's discovered that free stockings and ties are given out with every scent purchase, both departments formulate a plan to oust the intruder.

It's pay day at Grace Brothers and the staff realize that their money just doesn't go very far. An opportunity for a bonus arises when a customer loses a diamond and offers a £100 reward. Greed gets the better of everyone, except Mr. Grainger, and soon they're conspiring behind each others backs. Mr. Mash throws a wrench in the search after he damages a jeweled dress, causing a multitude of "diamonds" within the department.

It's Mr. Grainger's 37th anniversary at Grace Brothers and the Department hosts a celebration dinner for him. It's a time of happiness, and dread, for if he receives a cuckoo clock then it means he's to be retired.

A fuel shortage grips the country and Grace Brothers, so the stores furnaces are shut down for the day. The staff are freezing and soon develop unique ways to keep warm.

Sales are falling once again and so Mr. Rumbold calls together a "think tank", a suggestion he "borrowed" from Captain Peacock. The staff decide that a fashion show would be the answer, but when Young Mr. Grace won't cough up the dough to hire proper models, the staff are forced to put on the show themselves.

There's trouble afoot at Grace Brothers! Someone's been lifting Mrs. Slocombe's skirts and putting their hands in Mr. Grainger's drawers. Shoplifting has struck the store and Mr. Rumbold installs a store detective and a video surveillance system. It goes off track for awhile, as Mr. Rumbold turns into a voyeur and the staff act like they're on television. Ultimately, the staff decide to do in the scheme and prey on Mr. Rumbolds hypochondria to accomplish it.

The Store's redecoration plans threaten to interfere in the staffs vacations. Everyone is now expected to take the same two weeks off and there's disagreements on how to handle it. Grace Brother's Tour Group Company offers some package deals, but they are far from First Class.

Mr. Humphries begins displaying his ability to read palms and tell the future. He sees that Captain Peacock will soon be "climbing the ladder and wearing a new hat". Everyone takes this to mean a promotion, especially now that there's a vacancy on the Board of Directors and Mr. Rumbold is in line for it. Captain Peacock expects to take Mr. Rumbold's job. The department staff soon all imagine moving up.

Mr. Grainger is 5 minutes late coming back from his coffee break and this sets in motion a management scheme to monitor all breaks. The staff must sign in and sign out when they leave and return to the department. The department staff revolt and union action is taken

Captain Peacock is celebrating his 20th year at Grace Brothers, and while his request for a raise has been turned down, he has been given a key to the Executive Wash Room and the privilige of eating in the Executive Dining Room. He lords this over the department staff and Mr. Grainger decides to make some trouble.

Illnesses strike the Department, and Mr. Lucas decides to fake his to get the day off. His plan backfires as he is assigned to the Ladies Counter as a sort of "quarantine".

Naughty sayings on her underwear push Mrs. Slocombe to the brink of giving her notice, but then it's discovered that Old Mr. Grace plans to ask a member of the staff to marry him. When he calls for Mrs. Slocombe, everyone assumes she's the one.

The Ladies Department is temporarily closed due to refurbishing, so Mrs. Slocombe and Miss Brahms are given counter space over in the Gents. However, the men aren't very happy at having to share their area and do their best to make them unwelcome.

An after-hours staff meeting produces an idea to introduce background music and a recorded voice; the only question is--whose voice?

Mr. Grace has an idea to improve Christmas sales--all the staff are to wear novelty costumes, much to their annoyance.

The staff have kittens when Mrs. Slocombe announces she's expecting a happy event, but it turns out that it's merely her cat that's pregnant; when she refuses to leave Tiddles unattended, she braves the ire of Captain Peacock by smuggling the cat into the ladies' fitting room.

When Mr. Grace announces that he plans on temporarily reorganizing the departments, the staff are indignant, but find that work can be a lot of fun...if you're working in the toy department.

To celebrate Mr. Grace's 80th birthday, the staff organize This is Your Department, a spoof of This is Your Life.

Young Mr. Grace returns from a trip to the U.S. with a host of new sales techniques that he is eager to implement.

The staff prevent another firm's hostile takeover of Grace Brothers by impersonating the shareholders. Mr. Harman gives a rousing speech, and Grace Brothers is saved.

Mr. Grainger's temper has become extremely short. The staff, in a private meeting with Mr. Rumbold, decide he must go. However, when he wins the lottery, his bad mood vanishes and he makes his peace with the staff and stays on.