The first three series were released on DVD in Region 2 (UK) and Region 4 (Australia) without issue. The 1986 revival has had a spotty release history. It appeared on some budget "Complete Collection" box sets, but usually as a bonus feature, not as a standalone "Season 4." This lack of a clear digital footprint makes indexing hard.
– A mysterious fever lands the entire class in quarantine. Wedding Fever – Juan and Maria fall in love and prepare for a wedding. Everybody's Out – The students decide to form their own union. The First Lady index of mind your language season 4
Here lies the source of the confusion. In , seven years after the original cancellation, an attempt was made to revive the show. This is sometimes labeled as Season 4 by torrent sites and DVD distributors. The first three series were released on DVD
Here is a list of the episodes in Season 4 of Mind Your Language: – A mysterious fever lands the entire class in quarantine