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

https://medium.com/@robert-cox06/what-if-standard-arthritis-treatments-work-but-i-want-to-try-cannabis-anyway-85a8d5c7e058

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.