UK cannabis law changed in 2018 through the Misuse of Drugs Regulations 2001,...

https://codysimpressiveperspectives.hexaforgey.com/posts/who-decides-uk-drug-classification-acmd-or-home-secretary-2

UK cannabis law changed in 2018 through the Misuse of Drugs Regulations 2001, not the Misuse of Drugs Act 1971. This update allows specialist doctors to prescribe cannabis-based medicines like Sativex and Epidyolex under strict conditions