Here's why it fits your description:
* Old English BBC show: It was indeed a British show produced by the BBC and aired in the late 70s and 80s.
* Immigrants learning how to speak funny: The show focused on a group of diverse adult students learning English in an evening class. The students were from various countries and cultures, each with their own unique accents and ways of speaking.
* Only the teacher is and hilarious mistakes result from wrong use of words: The central character was Mr. Jeremy Brown, the teacher who constantly struggled with his students' misinterpretations and mispronunciations, leading to hilarious situations.
Key features of "Mind Your Language":
* Diverse cast: The students came from different countries like India, Spain, Italy, Greece, and more, each with their own unique personalities and accents.
* Teacher's frustration: Mr. Brown was constantly exasperated by the students' mistakes and attempts to correct them often led to more chaos.
* Situational humor: The show relied heavily on the misunderstandings and miscommunication that arose from the students' attempts to learn English.
If you're interested in watching this hilarious and culturally diverse comedy, it's available on various streaming platforms and DVD.