In 2018, UK cannabis law changed through an update to the Misuse of Drugs...

https://wiki-wire.win/index.php/Why_Do_Evidence-Based_Recommendations_Not_Always_Become_Policy_in_UK_Drug_Law%3F

In 2018, UK cannabis law changed through an update to the Misuse of Drugs Regulations 2001, not the Misuse of Drugs Act 1971. This allowed specialist doctors to prescribe cannabis-based medicines like Sativex and Epidyolex under Schedule 2 rules