Since 2018, medical cannabis has been legal in the UK for specific conditions....

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

Since 2018, medical cannabis has been legal in the UK for specific conditions. It isn’t a first-line treatment; you’ll need a specialist assessment, usually via private clinics, as NHS prescribing remains limited