As 5C break up for the very last time, they prepare to take life by the throat, the shirt, the vest or anything else they can lay their hands on.

Bernard and Penny dream of their wedding day: it should be the happiest day of their lives. However, Potter is chief usher, class 5C are guests, the meteorological department forecasts snow and there are those inevitable unforeseen problems.

Bernard Hedges has left Fenn Street School and the gap has been filled by Mr Dix, a living example of everything a teacher should not be. The staff long for a new young champion to challenge this tyrant, but when David Ffitchett-Brown arrives wearing beads, they wonder just what sort of champion they have.

When "Hank" Abbott, private detective, goes into action, he opens the cupboards that let out the skeletons. One produces a rash of honesty from Potter. The other makes Cromwell feel that Miss Ewell might yet be won back from Mr Sibley.

When Smithy falls ill in the country, Bernard sees Reigate in all its rustic glory. He is quite smitten and dreams of the idyllic married life there, but his fiance, Penny, dreams otherwise.

Wedding bells ring out for Miss Ewell and Mr Sibley. Meanwhile, Potter's ding-dong with his wife Ruby ends in a fly-away flourish.

Cromwell's latest idea is a school song for the first meeting of his newly-formed Old Fennians Association. With the staff bursting into a flurry of musical activity, and the return of the old Form 5C for the big event, it is a day to remember.

Cromwell's yo-yo obsession helps distract him from David's request for new school supplies, including a new television set that Mr Price attacked with Nitric Acid after his horse had lost a horse race. But between themselves and Potter they work out a cunning plan.

Bernard has finally decided to leave Fenn Street School, but he finds that resigning is not as simple as he had imagined.

Bernard has to say goodbye to his 5C class at Fenn Street School but his new class (4C) brings some unexpected problems.

Bernard and 5C drop in at the Conservative Club and make new friends. Maureen also makes a new friend, but he is more interested in dropping out.

Bernard has an annoying habit of being honourable - even when playing golf. But what of his pupils? When Duffy invites Sharon to a half-term Majorcan holiday, will the habit be catching?

When Bernard hears Abbott's version of the facts of life - which can only be described as high fiction - he feels that it is time to teach 5C the facts of life in an adult way.

End-of-term at Fenn Street, and the staff wait for their traditional presents from their forms. Bernard's anticipation at the thought of what he might get from 5C is tempered by the news that the injured Mr Wiggins will be fit to return as 5C's form master next term.

Headmaster Cromwell has a new toy to help him communicate with the whole school, but Price does not want to keep in touch, for an old enemy is out to get him.

When Cromwell succumbs to an attack of administrative megalomania, the Charge of the Light Brigade is cancelled, a class is lost at the cinema and Mr Price is driven to drink.

All contributions are gratefully accepted when magazine time comes around at Fenn Street School. But headmaster Cromwell's efforts to muster his usual support are thwarted by an irate local shopkeeper and Fenn Street's alternative press.

The amalgamation with neighbouring Weaver Street and the possibility of Fenn Street going comprehensive is more than the Fenn Street staff can cope with. Potter has to decide where his loyalties lie.

Potter's boasting about his war career gets out of hand when he is chosen to carry the banner at his El Alamein reunion.

When Fenn Street School holds a charity walk for the local "old and needy", the staff are confident of its success. But deciding just who the "needy" are, can be a tricky business.

When newly-qualified teacher Bernard Hedges arrives at Fenn Street Secondary Modern School to start his first job, even he hasn't bargained on what awaits him.

The Headmaster, Mr Cromwell, decides to divide the school into houses. But Bernard discovers that 5C's voting methods do not run along the normal lines.

Bernard's new job as sports master gives him the chance to help Eric Duffy solve a problem. Then Eric decides that one good turn deserves another.

Potter's on the warpath as someone has painted his wellies but 5C claim innocence. Bernard tries to get them interested in caring for geriatrics but the enthusiasm is lacking.

Duffy enters the embraces of the cold and harsh world outside school and finds it cold and harsh.

The headmaster's "Clean Up Fenn Street" campaign is in full swing. But when Potter takes on some temporary assistance, an explosive situation develops which threatens to clean up Fenn Street for good.

Fenn Street School makes sporting history when its football team reaches the semi-final of the district cup. But Miss Ewell has a match of her own with the star of the team, and if she wins, the school loses.

The Headmaster invites the staff out to dinner to celebrate his birthday - at their own expense. Abbott endeavours to copy Duffy's technique with the opposite sex, but after a night out with Maureen Bullock, he only lands himself in trouble with the police.

Bernard gets engaged and Abbott gets appendicitis.

Why does one set about weighing Fenn Street School? It seems that Bernard believes that acts like this will help prepare 5C for their entry into the great, wide world at the end of this term.

For Miss Ewell, life is not exactly a bowl of cherries at the moment. There is the school inspection to be organised, and the new Weaver Street kids to keep under control.

Headmaster Cromwell makes a new rule about haircuts and skirts at Fenn Street School. But the kids won't take this lying down, they decide on a sit-in to ask for pupil representation on staff meetings.

Fenn Street is having an open day and each class must contribute, even 5C. The only problem is that no-one told Bernard.

After a particularly raucous night out, Bernard wakes up in a strange bed in a state of alcoholic confusion. Things get worse when he discovers the bed belongs to Sharon's mother.