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

https://www.bookmarking-fox.win/uk-cannabis-law-changed-in-2018-through-the-misuse-of-drugs-regulations-2001

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