Since 2018, medical cannabis has been legal in the UK but is never a first-line...

https://tiny-wiki.win/index.php/What_if_standard_arthritis_treatments_work_but_I_want_to_try_cannabis_anyway%3F

Since 2018, medical cannabis has been legal in the UK but is never a first-line arthritis treatment. Access requires specialist assessment, usually via private clinics, after other therapies have failed. Always discuss options with a professional.