UK cannabis laws were adjusted in 2018 through the Misuse of Drugs Regulations...

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

UK cannabis laws were adjusted in 2018 through the Misuse of Drugs Regulations 2001, not the Misuse of Drugs Act 1971. This change made some cannabis-based medicines, like Sativex and Epidyolex, available on prescription but only from specialist doctors