In 2018, UK cannabis law was updated through changes to the Misuse of Drugs...
https://www.bookmark-zulu.win/uk-cannabis-law-can-be-confusing-in-2018-the-misuse-of-drugs-regulations
In 2018, UK cannabis law was updated through changes to the Misuse of Drugs Regulations 2001, not the Misuse of Drugs Act 1971