In 2018, UK cannabis law changed through an update to the Misuse of Drugs...
https://www.tool-bookmarks.win/in-2018-uk-cannabis-laws-were-updated-through-changes-to-the-misuse-of-drugs
In 2018, UK cannabis law changed through an update to the Misuse of Drugs Regulations 2001, not the Misuse of Drugs Act 1971