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

https://post-wiki.win/index.php/Do_UK_clinicians_consider_how_well_you_tolerated_previous_treatments_when_assessing_cannabis%3F

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