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

https://www.cast-bookmarks.win/medical-cannabis-became-legal-in-the-uk-in-2018-though-it-is-never-a

Since 2018, medical cannabis has been legal in the UK for specific conditions. It isn’t a first-line treatment, so specialists usually only consider it once other arthritis therapies have been exhausted