There is no "official list" of conditions for medical cannabis in the UK....

https://www.jelly-bookmarks.win/in-the-uk-medical-cannabis-eligibility-isn-t-based-on-a-fixed-list-of

There is no "official list" of conditions for medical cannabis in the UK. Instead, eligibility depends on a specialist consultant’s clinical review. You generally need to show that other standard treatments haven’t worked for your symptoms first