Audio described films on iTunes in the UK

tvOS & Apple TV Apps

Have noticed that a few more films have become available with audio description on iTunes in the UK. That's promising but I'm just wondering if I've already purchased a film that then has an AD track added, presumably then I won't have to re-purchase the film?

Some of the films that seem to now have AD include, The X-Files I want to believe, The Fantastic Four and The Taken trilogy.