I searched the Internet Archive for Season 4 of "Mind Your Language" and found that it is indeed available on the platform. The season consists of 6 episodes, which were uploaded to the Internet Archive in 2019.
Most people are familiar with the first three seasons (1977–1979). However, the show was eventually revived in 1986 for a fourth season, produced by an independent company. mind your language season 4 internet archive best
But there is a dark cloud over this cult classic: . I searched the Internet Archive for Season 4