Medical cannabis has been legal in the UK since 2018, but it isn’t a first-line...

https://victor-wiki.win/index.php/Can_Medical_Cannabis_Be_Used_Alongside_Physiotherapy_for_Arthritis%3F

Medical cannabis has been legal in the UK since 2018, but it isn’t a first-line arthritis treatment. Access requires a specialist assessment, usually through private clinics. If you're considering it, discuss your options with your doctor.