early 1970. Series Three The final three episodes of this series were affected by the ITV Colour Strike, which affected all ITV programmes recorded between November 1970 and March 1971. As a result of this industrial action, these affected episodes were recorded and transmitted in black and white. Series Four Unlike the previous series, episodes were initially broadcast on a Saturday. However, there was a week's break in transmission between Episode 14 (Old Fennians Day) and Episode 15 (What Are You Incinerating). When it returned it was broadcast in a Sunday night slot. This was only in London. In the other ITV regions, it continued to be broadcast on Saturdays at 6:30pm, so the rest of the nation saw the last 7 episodes of this series one day before Londoners saw them. Characters Staff Mr Bernard Hedges (Portrayed by John Alderton). A teacher fresh out of training. He was allocated Class 5C, the most unruly form in the school, at the beginning of term. At first relations were frosty between Bernard and Class 5C, but gradually Bernard gained the respect of his class and the rest of the staff. As the series progressed, he is shown to be a caring and very fair teacher and would always defend his form, regardless of how much evidence is put towards them. In the movie, he met air stewardess Penny Wheeler. After misinterpreting a 'few white lies' made by a pupil accidentally left behind, Penny began to take shine to Bernard. After a period of dating, Bernard attempted to propose to Penny but she already said yes before he could complete his sentence and they got engaged and later married. Shortly after Bernard got married, a new term started and he was allocated Class 4C. However, it was not quite the same as 5C. He later resigned and left at the end of Series 4 episode 2 to take a course in Sociology at the University of London.. Mr Norman Potter (Portrayed by Deryck Guyler). The pedantic and officious school caretaker. His speech is peppered with malapropisms. He claimed to have been a Desert Rat and constantly complains about the unruly behaviour of Hedges' class 5C. He is fiercely loyal (to the point of sycophancy) to the headmaster but a thorn in the side of the rest of the staff. His various comeuppances provide much of the ongoing humour of the sitcom. He