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

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

In 2018, UK cannabis law changed 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