Medicinal cannabis has been legal in the UK since 2018, though it is not...

https://doctiplus.net/arthritis-and-medical-cannabis-can-uk-patients-get-a-prescription/

Medicinal cannabis has been legal in the UK since 2018, though it is not considered a first-line treatment for arthritis. Access requires an assessment by a specialist doctor to determine if it is suitable for your specific clinical needs