In 2018, UK cannabis law changed through an update to the Misuse of Drugs...
https://www.toro-bookmarks.win/in-2018-uk-law-changed-the-misuse-of-drugs-regulations-2001-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