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

https://bizzmarkblog.com/is-cannabis-decriminalised-anywhere-in-the-uk/

Since 2018, UK cannabis law changed through an update to 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 Schedule 2