In 2018, UK cannabis law changed through an update to the Misuse of Drugs...
https://wiki-tonic.win/index.php/Is_It_Illegal_to_Import_Cannabis_into_the_UK_Even_for_Personal_Use%3F
In 2018, UK cannabis law changed through an update to the Misuse of Drugs Regulations 2001, not the Misuse of Drugs Act 1971