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

https://chancehbrs925.timeforchangecounselling.com/can-inflammatory-arthritis-patients-apply-for-medical-cannabis-in-the-uk

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.