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

https://www.active-bookmarks.win/since-medical-cannabis-was-legalised-in-the-uk-in-2018-the-process-for

Medical cannabis has been legal in the UK since 2018 for specific conditions. It is not a first-line treatment, so you will need a thorough assessment by a specialist doctor who reviews your full medical history