Total rename of existing title

So there was a title on the IMDb called "Watch With Mother": https://www.imdb.com/title/tt13932742 Now, "Watch With Mother" wasn't really a TV show in and of itself, but an umbrella title the BBC used to show lots of different kid's TV shows. Most of these shows have their own individual titles, except for one - Bizzy Lizzy, a 1960s show about a doll and a magic flower. (This is important stuff, obviously) So I was going to make the Bizzy Lizzy title, but then I saw that every single episode under "Watch With Mother" was a Bizzy Lizzy episode, and none of the other shows - such as https://www.imdb.com/title/tt0398550 - were under it. Rather than create a new title and migrate all the episodes across, it seemed more efficient and less time consuming to just rename Watch With Mother to Bizzy Lizzy. I did this, and it was accepted, but the "Watch With Mother" title is still on it. For this to work, it needs to be removed completely, and the title just left as "Bizzy Lizzy". Just to reiterate, "Watch With Mother" wasn't the title of a TV show per se, but an umbrella title for LOTS of different shows: https://en.wikipedia.org/wiki/Watch_with_Mother