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

https://averysnewchat.zenbloomer.com/posts/what-is-nationwide-pharmacies-and-what-do-they-do

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