One can imagine writer John Sullivan being buffeted by the demands of the key actors: Belinda Lang had become so one-dimensional as the frigid 'Tiger' that she half-leaves the series (supposedly in Greece) for a better project elsewhere. Ralph Bates presumably had demanded to be a slightly less pathetic character by achieving some success with the women, but now that the character who was going to complete this arc (Kate/'Tiger') is disappearing, Sullivan suddenly needed to create an attractive new character for 'John' to get his leg over with. Peter Blake as Kirk St Moritz also wanted to be less one-dimensional, so Sullivan allows him to disclose some feelings of affection towards Tiger, which are even reciprocated to a minor extent. Only the magnificent Peter Denyer as Ralph Dring keeps his character on a steady path.
Ricky Fortune only appears in one episode, and the woman at the back of the class who never said much anyway leaves for Newcastle at the end of the same episode.
The series descends into comic-book fantasy when the Kirk St Moritz persona is brought back to beat up a gang of Hells Angels in an unseen pub fight that leaves his hair and 'Saturday Night Fever' suit untarnished.
The only credible real-life character in the whole series is John himself; everyone else is comic-book and a poor advert for the writer's craft. The most touching and even believable scene comes at the end of the Christmas episode when he has the choice of spending the holiday with his still-quite-sexy ex-wife or having dinner with the crabby Mrs Lermanski.