Medical cannabis has been legal since 2018, though it isn't a first-line...

https://source-wiki.win/index.php/What_is_meant_by_cannabis-based_medicinal_products_(CBMPs)_in_the_UK%3F

Medical cannabis has been legal since 2018, though it isn't a first-line treatment for arthritis. Access requires a specialist assessment, typically through private clinics, as NHS prescriptions are rare. Please discuss options with a professional.