Mind Your Language season 1 episode 4: Giovanni, Max and Ranjeet are on a tea break while Sid teaches them Cockney rhyming slang, which they don’t understand. When Mr. Brown approaches them, he explains the slang to them and brings them back to class. Miss Courtney decides to check on the class’s progress. Mr. Brown teaches them about groceries for the rest of the period. The students give either stupid or proper answers. The class don’t do too well so Mr. Brown has them stay 30 minutes late.
When Mr. Brown falls asleep, Sid locks them in by mistake. Mr. Brown and his students try ways to get out of the classroom, such as breaking the door down and shouting for help, but fail. He then asks the students if their relatives are missing them, to which there’s no proper answer. In the meantime, they tell jokes and sing to pass the time. Later, Sid is on his way home from the pub with his friend Charlie when he sees Mr. Brown and the students waving, so he calls up Miss Courtney and unlocks the door. The students leave the classroom, but Mr. Brown goes back in to get his groceries. Miss Courtney goes in as well, and Sid locks them in by mistake (again). Miss Courtney tries to call out to Sid, but to no avail. When she asks Mr. Brown what they are going to do, he sheepishly tells her that they can sing songs to pass the time with groceries to survive for the weekend.