Legal in the UK since 2018, medical cannabis is an option for some arthritis...

https://highstylife.com/is-there-a-safe-way-to-explore-cannabis-for-arthritis-without-buying-illegally/

Legal in the UK since 2018, medical cannabis is an option for some arthritis patients, though it is never a first-line treatment. Access requires a formal specialist assessment, usually via private clinics