: Many complete episodes with English subtitles are hosted on various community playlists, such as the Mind Your Language - All Seasons Archive.org
Search GitHub for mind-your-language-subtitles . A user group called “ESL Subtitle Project” has been systematically re-syncing and correcting every episode for the hearing impaired. This is your goldmine for updated files.
: Several channels host complete playlists of the sitcom. While many are free to watch, you should look for those labeled with "English Subs" or "HD with subtitles" to ensure the text is baked into the video or available via the "CC" button. Mind Your Language - All Seasons Complete Series Playlist
Click and select the SRT file you downloaded.