In 2018, the UK updated the Misuse of Drugs Regulations 2001—not the 1971...

https://www.foxtrot-bookmarks.win/in-2018-uk-law-changed-the-misuse-of-drugs-regulations-2001-to-allow

In 2018, the UK updated the Misuse of Drugs Regulations 2001—not the 1971 Act—to allow specialist doctors to prescribe cannabis-based medicines like Sativex and Epidyolex under Schedule 2. Recreational cannabis remains a Class B drug