Legal since 2018, medical cannabis isn't a first-line treatment for arthritis....

https://www.bust-bookmark.win/medical-cannabis-has-been-legal-in-the-uk-since-2018-but-it-s-not-a-first-line

Legal since 2018, medical cannabis isn't a first-line treatment for arthritis. You’ll usually need to have tried other options before a specialist assessment. Most access is currently through private clinics. Please talk to a qualified professional.