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

https://www.bookmarking-base.win/in-2018-the-uk-s-misuse-of-drugs-regulations-2001-were-updated-to-allow

In 2018, UK cannabis law changed through an update to the Misuse of Drugs Regulations 2001, not the Misuse of Drugs Act 1971