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

https://fast-wiki.win/index.php/Why_Are_Most_Medical_Cannabis_Prescriptions_in_the_UK_for_Unlicensed_Products%3F

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