In 2018, UK cannabis law was updated by changing the Misuse of Drugs...

https://wiki-club.win/index.php/Why_Did_the_Government_Choose_a_Regulatory_Amendment_Instead_of_Changing_the_Act%3F

In 2018, UK cannabis law was updated by changing 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