In the UK, there isn’t a fixed ‘approved’ list for medical cannabis...

https://www.bookmark-tango.win/navigating-medical-cannabis-access-in-the-uk-can-be-complex-there-isn-t-a

In the UK, there isn’t a fixed ‘approved’ list for medical cannabis eligibility; it’s a clinical decision made by a specialist doctor. Generally, you must have tried at least two conventional treatments first without sufficient success