There wasn’t much fanfare when Happy Ever After transformed itself into Terry And June. Take this small paragraph in an article about Mike Yarwood of all things, in The Stage on 9th August 1979.
Lots of other little nuggets and announcements in there too.
Happy Ever After ended after six series, when one of the writers (John Chapman) felt that it had run its course. The BBC wanted more, and re-tooled the show, removing Aunt Lucy, and relocating the main couple to Purley. The new show became Terry And June, which began airing at the end of 1979, and ran for nine series until 1987.
The change barely fooled anyone though, not least The Sunday Mirror.