Since November 2018, medical cannabis has been legal in the UK via specialist...

https://www.booknose.win/medical-cannabis-has-been-legal-in-the-uk-since-nov-2018-it-requires-a

Since November 2018, medical cannabis has been legal in the UK via specialist prescription—usually when other conventional treatments haven’t worked for you. While technically available on the NHS, successful access via that route remains very rare