In 2018, UK cannabis law was updated through the Misuse of Drugs Regulations...

https://blogfreely.net/neasalnfbo/what-is-the-gmc-specialist-register-and-why-does-it-matter-for-cannabis

In 2018, UK cannabis law was updated through the Misuse of Drugs Regulations 2001, not the Misuse of Drugs Act 1971. This change allows specialist doctors to prescribe cannabis-based medicines like Sativex and Epidyolex under Schedule 2 rules