I made a topic called “British Stories” (the name of my course) and it had the slug /british-stories.

I’ve since deleted that topic, and I want to make a forum with the same name. However I’m unable to get the slug “british-stories” … instead I get “british-stories-1” 

… is there any way to free up this slug? I guess it’s still stored in the database somewhere, even though it’s no longer in use.