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

https://wiki-fusion.win/index.php/Why_Are_NHS_Medical_Cannabis_Prescriptions_So_Rare%3F

In 2018, UK cannabis law changed through updates 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