UK cannabis law changed in 2018 through an update to the Misuse of Drugs...

https://mighty-wiki.win/index.php/Who_Decides_UK_Drug_Classification:_ACMD_or_Home_Secretary%3F

UK cannabis law changed in 2018 through an update 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