In 2018, UK cannabis laws changed through updates to the Misuse of Drugs...

https://touch-wiki.win/index.php/Why_the_Word_%22Legalised%22_Is_Wrong_When_Talking_About_UK_Medical_Cannabis

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