[AchillesPunks]

In case this is of any use... https://kodi.wiki/view/HOW-TO:Movie_universe

Thanks for that! It looks interesting.
I'm going to see if somebody has a solution that doesn't involve me renaming and rescanning a whole bunch of movies, but otherwise that will be the way to go!

If you have already sorted it inside HUBs you might try and clean database inside media settings in kodi. Then delete the cache13.db, and cache, inside the roaming folder then restart Kodi. If any posters are black just hit info and refresh or select artwork inside info.