In 2018, UK cannabis law was updated through changes to the Misuse of Drugs...

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

In 2018, UK cannabis law was updated through changes to the Misuse of Drugs Regulations 2001—not the Misuse of Drugs Act 1971. These changes allow specialist doctors to prescribe certain cannabis-based medicines like Sativex and Epidyolex under Schedule 2