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

https://isabellasbestperspectives.quillnesty.com/posts/what-does-it-mean-that-cannabis-remains-controlled-in-the-uk

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