In 2018, UK cannabis law was updated through changes to the Misuse of Drugs...
https://www.bookmarking-jet.win/in-2018-changes-to-the-misuse-of-drugs-regulations-2001-allowed-specialist
In 2018, UK cannabis law was updated through changes to the Misuse of Drugs Regulations 2001, not the Misuse of Drugs Act 1971