In 2018, UK cannabis law was updated by changing the Misuse of Drugs...

https://oliviasmasterinsight.quantlynix.com/posts/does-the-uk-medicines-regulator-approve-most-cannabis-products

In 2018, UK cannabis law was updated by changing 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