Medical cannabis has been legal in the UK since 2018 for specific conditions....

https://mike-wiki.win/index.php/Can_I_get_medical_cannabis_for_arthritis_in_the_UK%3F

Medical cannabis has been legal in the UK since 2018 for specific conditions. It isn’t a first-line treatment for arthritis; you’ll need a specialist assessment, usually through private clinics. Always chat with your GP to explore your options.