In 2018, UK cannabis law was updated through changes to the Misuse of Drugs...
https://www.cool-bookmarks.win/in-2018-uk-cannabis-laws-saw-a-specific-update-to-the-misuse-of-drugs
In 2018, UK cannabis law was updated through changes to the Misuse of Drugs Regulations 2001, not the Misuse of Drugs Act 1971